{"id":346,"date":"2018-12-27T16:51:52","date_gmt":"2018-12-27T16:51:52","guid":{"rendered":"https:\/\/notiz.comanet.xyz\/?p=346"},"modified":"2019-03-03T19:42:28","modified_gmt":"2019-03-03T18:42:28","slug":"macbook-pro-how-to-disable-discrete-gpu-permanently-from-efi","status":"publish","type":"post","link":"https:\/\/notiz.comanet.xyz\/?p=346","title":{"rendered":"MacBook Pro: How to disable discrete GPU permanently from EFI?"},"content":{"rendered":"<div class=\"postcell post-layout--right\">\n<div class=\"post-text\" itemprop=\"text\">\n<p> \t\t\tI&#39;d like to disable the NVidia GTX 750M GPU on my MacBook Pro 15&quot; (Retina, Mid 2014, Mac OS X 10.10 Yosemite). I know I can use GfxCardStatus but I read I could have a more permanent solution by changing some EFI flag.<\/p>\n<p> \t\t\t<strong>My question is:<\/strong><\/p>\n<ul>\n<li>\n<p> \t\t\t\t\t<strong>How can I disable the discrete GPU from EFI?<\/strong><\/p>\n<p> \t\t\t\t\tI assume this is persistent across multiple reboots. I&#39;d also want to know how to undo it if needed.<\/p>\n<\/li>\n<\/ul>\n<p> \t\t\tUpdate:<\/p>\n<p> \t\t\tThe question is basically whether the command mentioned in <a href=\"https:\/\/github.com\/codykrieger\/gfxCardStatus\/issues\/184#issuecomment-68181412\" rel=\"noreferrer\">GfxCardStatus github issue comment here<\/a> is correct or not, and how to undo it if it doesn&#39;t work.<\/p>\n<p> \t\t\t.<\/p>\n<p> \t\t\tAn answer to this alone is a correct answer, but it&#39;ll be awesome if you can also tell me:<\/p>\n<ul>\n<li>\n<p> \t\t\t\t\tIf you force integrated graphics in GfxCardStatus, Mac OS X (up to Yosemite at least) doesn&#39;t allow you to use multiple monitors (even though the built in Iris Pro can do it).<\/p>\n<p> \t\t\t\t\tIf I disable the discrete GPU from EFI, will macOS think that the integrated GPU is the one installed and will it let me use multiple monitors with it?<\/p>\n<\/li>\n<li>\n<p> \t\t\t\t\tI heard that the same EFI setting is responsible for not even showing the integrated GPU to other operating systems than macOS and you have to trick it somehow to think it&#39;s macOS.<\/p>\n<p> \t\t\t\t\tIs that true? And if yes, how to do that?<\/p>\n<\/li>\n<\/ul><\/div>\n<div class=\"post-taglist grid gs4 gsy fd-column\">\n<div class=\"grid ps-relative d-block\"> \t\t\t<a class=\"post-tag js-gps-track\" href=\"https:\/\/apple.stackexchange.com\/questions\/tagged\/macos\" rel=\"tag\" title=\"show questions tagged 'macos'\">macos<\/a> <a class=\"post-tag js-gps-track\" href=\"https:\/\/apple.stackexchange.com\/questions\/tagged\/macbook\" rel=\"tag\" title=\"show questions tagged 'macbook'\">macbook<\/a> <a class=\"post-tag js-gps-track\" href=\"https:\/\/apple.stackexchange.com\/questions\/tagged\/mac\" rel=\"tag\" title=\"show questions tagged 'mac'\">mac<\/a> <a class=\"post-tag js-gps-track\" href=\"https:\/\/apple.stackexchange.com\/questions\/tagged\/gpu\" rel=\"tag\" title=\"show questions tagged 'gpu'\">gpu<\/a> <a class=\"post-tag js-gps-track\" href=\"https:\/\/apple.stackexchange.com\/questions\/tagged\/efi\" rel=\"tag\" title=\"show questions tagged 'efi'\">efi<\/a><\/div>\n<\/p><\/div>\n<div class=\"mb0 \">\n<div class=\"mt16 pt4 grid gs8 gsy fw-wrap jc-end ai-start\">\n<div class=\"grid--cell mr16\" style=\"flex: 1 1 100px;\">\n<div class=\"post-menu\"> \t\t\t\t\t<a class=\"short-link\" href=\"https:\/\/apple.stackexchange.com\/q\/166876\" id=\"link-post-166876\" title=\"short permalink to this question\">share<\/a><a class=\"suggest-edit-post\" href=\"https:\/\/apple.stackexchange.com\/posts\/166876\/edit\" title=\"\">improve this question<\/a><\/div>\n<\/p><\/div>\n<div class=\"post-signature grid--cell\">\n<div class=\"user-info user-hover\">\n<div class=\"user-action-time\" style=\"margin-left: 0px !important;\"> \t\t\t\t\t\t<a href=\"https:\/\/apple.stackexchange.com\/posts\/166876\/revisions\" title=\"show all edits to this post\">edited <span class=\"relativetime\" title=\"2017-10-07 12:59:54Z\">Oct 7 &#39;17 at 12:59<\/span><\/a><\/div>\n<div class=\"user-gravatar32 wb-hat-checked\">\n<div class=\"hat\" 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\">\n<div class=\"user-action-time\"> \t\t\t\t\t\tasked <span class=\"relativetime\" title=\"2015-01-11 12:09:46Z\">Jan 11 &#39;15 at 12:09<\/span><\/div>\n<div class=\"user-gravatar32 wb-hat-checked\">\n<div class=\"gravatar-wrapper-32\"> \t\t\t\t\t\t\t<a href=\"https:\/\/apple.stackexchange.com\/users\/22634\/meligy\"><img loading=\"lazy\" decoding=\"async\" alt=\"\" height=\"32\" src=\"https:\/\/www.gravatar.com\/avatar\/67de62b6f38aeddc4b57f0a32bed5681?s=32&amp;d=identicon&amp;r=PG\" width=\"32\" \/><\/a><\/div>\n<\/p><\/div>\n<div class=\"user-details\"> \t\t\t\t\t\t<a href=\"https:\/\/apple.stackexchange.com\/users\/22634\/meligy\">Meligy<\/a> \t\t\t\t\t\t<\/p>\n<div class=\"-flair\"> \t\t\t\t\t\t\t<span class=\"reputation-score\" dir=\"ltr\" title=\"reputation score \">311<\/span><span title=\"1 gold badge\"><span class=\"badgecount\">1<\/span><\/span><span title=\"5 silver badges\"><span class=\"badgecount\">5<\/span><\/span><span title=\"8 bronze badges\"><span class=\"badgecount\">8<\/span><\/span><\/div>\n<\/p><\/div>\n<\/p><\/div>\n<\/p><\/div>\n<\/p><\/div>\n<\/p><\/div>\n<\/p><\/div>\n<div class=\"post-layout--right\">\n<div class=\"comments js-comments-container \" id=\"comments-166876\">\n<ul class=\"comments-list js-comments-list\" data-addlink-disabled=\"true\" data-canpost=\"false\" data-cansee=\"true\" data-comments-unavailable=\"false\" data-remaining-comments-count=\"0\">\n<li class=\"comment js-comment \" data-comment-id=\"195663\" id=\"comment-195663\">\n<div class=\"js-comment-actions comment-actions\">\n<div class=\"comment-score\"> \t\t\t\t\t\t<span class=\"cool\" title=\"number of 'useful comment' votes received\">4<\/span><\/div>\n<\/p><\/div>\n<div class=\"comment-text js-comment-text-and-form\">\n<div class=\"comment-body\" style=\"display: block;\"> \t\t\t\t\t\t<span class=\"comment-copy\">This looks like a classic <a href=\"http:\/\/xyproblem.info\" rel=\"nofollow noreferrer\">XY Problem<\/a>. What are you actually trying to achieve?<\/span> &ndash;&nbsp;<a class=\"comment-user\" href=\"https:\/\/apple.stackexchange.com\/users\/85275\/tetsujin\" title=\"58,147 reputation\">Tetsujin<\/a> <span class=\"comment-date\" dir=\"ltr\"><a class=\"comment-link\" href=\"https:\/\/apple.stackexchange.com\/questions\/166876\/macbook-pro-how-to-disable-discrete-gpu-permanently-from-efi#comment195663_166876\"><span class=\"relativetime-clean\" title=\"2015-01-11 14:02:45Z\">Jan 11 &#39;15 at 14:02<\/span><\/a><\/span><\/div>\n<\/p><\/div>\n<\/li>\n<li class=\"comment js-comment \" data-comment-id=\"195667\" id=\"comment-195667\">\n<div class=\"js-comment-actions comment-actions\">\n<div class=\"comment-score\"> \t\t\t\t\t\t<span class=\"cool\" title=\"number of 'useful comment' votes received\">4<\/span><\/div>\n<\/p><\/div>\n<div class=\"comment-text js-comment-text-and-form\">\n<div class=\"comment-body\" style=\"display: block;\"> \t\t\t\t\t\t<span class=\"comment-copy\">What I&#39;m trying to achieve is disable discrete GPU from EFI.<\/span> &ndash;&nbsp;<a class=\"comment-user owner\" href=\"https:\/\/apple.stackexchange.com\/users\/22634\/meligy\" title=\"311 reputation\">Meligy<\/a> <span class=\"comment-date\" dir=\"ltr\"><a class=\"comment-link\" href=\"https:\/\/apple.stackexchange.com\/questions\/166876\/macbook-pro-how-to-disable-discrete-gpu-permanently-from-efi#comment195667_166876\"><span class=\"relativetime-clean\" title=\"2015-01-11 14:31:00Z\">Jan 11 &#39;15 at 14:31<\/span><\/a><\/span><\/div>\n<\/p><\/div>\n<\/li>\n<li class=\"comment js-comment \" data-comment-id=\"195669\" id=\"comment-195669\">\n<div class=\"js-comment-actions comment-actions\">\n<div class=\"comment-score\"> \t\t\t\t\t\t<span class=\"cool\" title=\"number of 'useful comment' votes received\">4<\/span><\/div>\n<\/p><\/div>\n<div class=\"comment-text js-comment-text-and-form\">\n<div class=\"comment-body\" style=\"display: block;\"> \t\t\t\t\t\t<span class=\"comment-copy\">No, that&#39;s the procedure you have decided will achieve your aim, not your actual aim.<\/span> &ndash;&nbsp;<a class=\"comment-user\" href=\"https:\/\/apple.stackexchange.com\/users\/85275\/tetsujin\" title=\"58,147 reputation\">Tetsujin<\/a> <span class=\"comment-date\" dir=\"ltr\"><a class=\"comment-link\" href=\"https:\/\/apple.stackexchange.com\/questions\/166876\/macbook-pro-how-to-disable-discrete-gpu-permanently-from-efi#comment195669_166876\"><span class=\"relativetime-clean\" title=\"2015-01-11 14:35:31Z\">Jan 11 &#39;15 at 14:35<\/span><\/a><\/span><\/div>\n<\/p><\/div>\n<\/li>\n<li class=\"comment js-comment \" data-comment-id=\"195670\" id=\"comment-195670\">\n<div class=\"js-comment-actions comment-actions\">\n<div class=\"comment-score\"> \t\t\t\t\t\t<span class=\"warm\" title=\"number of 'useful comment' votes received\">5<\/span><\/div>\n<\/p><\/div>\n<div class=\"comment-text js-comment-text-and-form\">\n<div class=\"comment-body\" style=\"display: block;\"> \t\t\t\t\t\t<span class=\"comment-copy\">Have a permanent saving on battery, and reduce heat, without paying the noise cost. I got the NVidia one because I wanted top CPU &amp; SSD upgrades &amp; this was the prebuilt one. If I could wait for custom build, I&#39;d have got the integrated GPU one.<\/span> &ndash;&nbsp;<a class=\"comment-user owner\" href=\"https:\/\/apple.stackexchange.com\/users\/22634\/meligy\" title=\"311 reputation\">Meligy<\/a> <span class=\"comment-date\" dir=\"ltr\"><a class=\"comment-link\" href=\"https:\/\/apple.stackexchange.com\/questions\/166876\/macbook-pro-how-to-disable-discrete-gpu-permanently-from-efi#comment195670_166876\"><span class=\"relativetime-clean\" title=\"2015-01-11 14:38:02Z\">Jan 11 &#39;15 at 14:38<\/span><\/a><\/span> <span title=\"this comment was edited 1 time\"> <svg aria-hidden=\"true\" class=\"svg-icon va-text-bottom o50 iconPencilSm\" height=\"14\" viewbox=\"0 0 14 14\" width=\"14\"><\/svg><\/span><\/div>\n<\/p><\/div>\n<\/li>\n<\/ul><\/div>\n<\/p><\/div>\n<div class=\"question\" data-questionid=\"166876\" id=\"question\">\n<div class=\"post-layout\">\n<div class=\"post-layout--right\">\n<div class=\"comments js-comments-container \" id=\"comments-166876\">\n<ul class=\"comments-list js-comments-list\" data-addlink-disabled=\"true\" data-canpost=\"false\" data-cansee=\"true\" data-comments-unavailable=\"false\" data-remaining-comments-count=\"0\">\n<li class=\"comment js-comment \" data-comment-id=\"195670\" id=\"comment-195670\">\n<div class=\"comment-text js-comment-text-and-form\">\n<div class=\"comment-body\" style=\"display: block;\"> \t\t\t\t\t\t\t\t&nbsp;<\/div>\n<\/p><\/div>\n<\/li>\n<li class=\"comment js-comment \" data-comment-id=\"198918\" id=\"comment-198918\">\n<div class=\"js-comment-actions comment-actions\">\n<div class=\"comment-score\"> \t\t\t\t\t\t\t\t<span class=\"cool\" title=\"number of 'useful comment' votes received\">2<\/span><\/div>\n<\/p><\/div>\n<div class=\"comment-text js-comment-text-and-form\">\n<div class=\"comment-body\" style=\"display: block;\"> \t\t\t\t\t\t\t\t<span class=\"comment-copy\">A solution to this question would also be useful to owners of 2011 MBP models that have a defective discrete GPU. It is certainly possible to disable the discrete GPU when using Linux, see my question here: <a href=\"http:\/\/apple.stackexchange.com\/questions\/168167\/can-i-use-linux-in-a-2011-macbook-pro-with-a-defective-discrete-gpu\" title=\"can i use linux in a 2011 macbook pro with a defective discrete gpu\">apple.stackexchange.com\/questions\/168167\/&hellip;<\/a><\/span> &ndash;&nbsp;<a class=\"comment-user\" href=\"https:\/\/apple.stackexchange.com\/users\/34825\/xpereta\" title=\"257 reputation\">xpereta<\/a> <span class=\"comment-date\" dir=\"ltr\"><a class=\"comment-link\" href=\"https:\/\/apple.stackexchange.com\/questions\/166876\/macbook-pro-how-to-disable-discrete-gpu-permanently-from-efi#comment198918_166876\"><span class=\"relativetime-clean\" title=\"2015-01-28 11:26:03Z\">Jan 28 &#39;15 at 11:26<\/span><\/a><\/span><\/div>\n<\/p><\/div>\n<\/li>\n<\/ul><\/div>\n<div data-anon=\"true\" data-rep=\"50\" id=\"comments-link-166876\"> \t\t\t\t<a class=\"js-add-link comments-link disabled-link \" title=\"Use comments to ask for more information or suggest improvements. Avoid answering questions in comments.\">add a comment<\/a><\/div>\n<\/p><\/div>\n<\/p><\/div>\n<\/p><\/div>\n<div id=\"answers\"> \t<a name=\"tab-top\"><\/a> \t<\/p>\n<div id=\"answers-header\">\n<div class=\"subheader answers-subheader\">\n<h2 data-answercount=\"5\"> \t\t\t\t5 Answers<\/h2>\n<div>\n<div id=\"tabs\"> \t\t\t\t\t<a data-nav-xhref=\"\" data-shortcut=\"A\" data-value=\"active\" href=\"https:\/\/apple.stackexchange.com\/questions\/166876\/macbook-pro-how-to-disable-discrete-gpu-permanently-from-efi?answertab=active#tab-top\" title=\"Answers with the latest activity first\"> active<\/a> <a data-nav-xhref=\"\" data-shortcut=\"O\" data-value=\"oldest\" href=\"https:\/\/apple.stackexchange.com\/questions\/166876\/macbook-pro-how-to-disable-discrete-gpu-permanently-from-efi?answertab=oldest#tab-top\" title=\"Answers in the order they were provided\"> oldest<\/a> <a class=\"youarehere is-selected \" data-nav-xhref=\"\" data-shortcut=\"V\" data-value=\"votes\" href=\"https:\/\/apple.stackexchange.com\/questions\/166876\/macbook-pro-how-to-disable-discrete-gpu-permanently-from-efi?answertab=votes#tab-top\" title=\"Answers with the highest score first\"> votes<\/a><\/div>\n<\/p><\/div>\n<\/p><\/div>\n<\/p><\/div>\n<p> \t<a name=\"285896\"><\/a> \t<\/p>\n<div class=\"answer\" data-answerid=\"285896\" id=\"answer-285896\" itemscope=\"\" itemtype=\"http:\/\/schema.org\/Answer\">\n<div class=\"post-layout\">\n<div class=\"votecell post-layout--left\">\n<div class=\"vote\"> \t\t\t\t\t<a class=\"vote-up-off\" title=\"This answer is useful\">up vote<\/a> <span class=\"vote-count-post \" itemprop=\"upvoteCount\">36<\/span> <a class=\"vote-down-off\" title=\"This answer is not useful\">down vote<\/a> \t\t\t\t\t<\/p>\n<div class=\"bounty-award-container\"> \t\t\t\t\t\t<span class=\"bounty-award\" title=\"This answer has been awarded bounties worth 50 reputation by Mohamed Abo Badawy\">+50<\/span><\/div>\n<\/p><\/div>\n<\/p><\/div>\n<div class=\"answercell post-layout--right\">\n<div class=\"post-text\" itemprop=\"text\">\n<p> \t\t\t\t\t\tYou can <strong>permanently disable discrete graphics card<\/strong> following next steps:<\/p>\n<h3> \t\t\t\t\t\tUPDATE! Try to edit NVRAM variable from Single-User mode<\/h3>\n<p> \t\t\t\t\t\tThe procedure described in the steps 1-3 worked for me until macOS Sierra, but with the upgrade to High Sierra, I started getting a pinkish\/reddish screen and I was unable to enter Recovery mode to repeat step 3 as I had to do in previous upgrades. Searching in internet, I stepped into <a href=\"https:\/\/github.com\/0xbb\/gpu-switch\/issues\/41\" rel=\"noreferrer\">this GitHub issue<\/a> explaining you may be able to replace steps 1 and 2 with the following command, that you can execute in Single-User mode (boot pressing <kbd>cmd<\/kbd>+<kbd>s<\/kbd>):<\/p>\n<pre><code>sudo nvram fa4ce28d-b62f-4c99-9cc3-6815686e30f9:gpu-power-prefs=%01%00%00%00 <\/code><\/pre>\n<h3> \t\t\t\t\t\t1. Prepare a Bootable USB pendrive with a non GUI Linux<\/h3>\n<p> \t\t\t\t\t\t<strong>1.1 Download ArchLinux ISO<\/strong><\/p>\n<ul>\n<li> \t\t\t\t\t\t\tYou need a working computer for that and a spare CD\/DVD\/USB drive.<\/li>\n<li> \t\t\t\t\t\t\tDownload the latest <a href=\"https:\/\/www.archlinux.org\/download\/\" rel=\"noreferrer\">Arch Linux ISO image<\/a>.<\/li>\n<li> \t\t\t\t\t\t\tThen you could either simply burn this ISO to CD\/DVD (which later could be either inserted to MBP&#39;s SuperDrive or External DVD Drive connected to MBP by two USB cables) or create a <a href=\"https:\/\/wiki.archlinux.org\/index.php\/USB_flash_installation_media\" rel=\"noreferrer\">bootable USB<\/a>.<\/li>\n<\/ul>\n<p> \t\t\t\t\t\t<strong>1.2 Creating the bootable USB with the .iso<\/strong><\/p>\n<ul>\n<li> \t\t\t\t\t\t\tFirst, you need to identify the USB device.<\/li>\n<li>\n<p> \t\t\t\t\t\t\t\tOpen \/Applications\/Utilities\/Terminal in MacOS and list all storage devices:<\/p>\n<p> \t\t\t\t\t\t\t\t<code>diskutil list<\/code><\/p>\n<p> \t\t\t\t\t\t\t\tYour USB device will appear as something like <code>\/dev\/disk2 (external, physical)<\/code>. Verify that this is the device you want to erase by checking its name and size and then use its identifier for the commands below instead of <code>\/dev\/diskX<\/code>.<\/p>\n<\/li>\n<li>\n<p> \t\t\t\t\t\t\t\tA USB device is normally auto-mounted in macOS, and you have to unmount (not eject) it before block-writing to it with dd:<\/p>\n<p> \t\t\t\t\t\t\t\t<code>diskutil unmountDisk \/dev\/diskX<\/code><\/p>\n<\/li>\n<li>\n<p> \t\t\t\t\t\t\t\tNow copy the ISO image file to the device. The dd command is similar to its Linux counterpart, but notice the &#39;r&#39; before &#39;disk&#39; for raw mode which makes the transfer much faster:<\/p>\n<p> \t\t\t\t\t\t\t\t<code>sudo dd if=path\/to\/arch.iso of=\/dev\/rdiskX bs=1m<\/code><\/p>\n<p> \t\t\t\t\t\t\t\tAfter completion, macOS may complain that &quot;The disk you inserted was not readable by this computer&quot;. Select &#39;Eject&#39;. The USB device will be bootable.<\/p>\n<\/li>\n<\/ul>\n<h3> \t\t\t\t\t\t2. Use Linux to change EFI vars<\/h3>\n<p> \t\t\t\t\t\t<strong>2.1 Boot to it<\/strong><\/p>\n<ul>\n<li> \t\t\t\t\t\t\tInsert this CD\/DVD\/USB to Macbook Pro, hold Option key (alt) while booting.<\/li>\n<li> \t\t\t\t\t\t\tChoose &quot;EFI boot&quot; (that is your bootable installation media).<\/li>\n<li> \t\t\t\t\t\t\tWhen the menu shows, press &quot;e&quot; key to edit the GRUB options of the Arch Linux archiso x86_64 UEFI CD menu entry while it is selected at the main screen, add <code>nomodeset<\/code> to the end of this line and press Enter.<\/li>\n<li> \t\t\t\t\t\t\tIf everything is done correctly, you will find yourself at the Linux console! (It takes some time so be patient and wait for the prompt)<\/li>\n<\/ul>\n<p> \t\t\t\t\t\t<strong>2.2 Clear existing EFI vars<\/strong><\/p>\n<p> \t\t\t\t\t\tLooks like efivarfs filesystem is mounted by default! So you can already <code>cd \/sys\/firmware\/efi\/efivars<\/code> and <code>ls<\/code> to explore this directory and see if there is a <code>gpu-power-prefs-...<\/code> variable (where &#8230; is UUID of this variable).<\/p>\n<ul>\n<li>\n<p> \t\t\t\t\t\t\t\tIf there is such a variable, it&#39;s better to remove it with rm.<\/p>\n<p> \t\t\t\t\t\t\t\t<code>rm gpu-power-prefs-&hellip;<\/code><\/p>\n<\/li>\n<li>\n<p> \t\t\t\t\t\t\t\tIf you are getting the &quot;operation not permitted&quot; message while attempting to <code>rm<\/code>, it means that efivarfs has been mounted as read-only and you need to remount it with read-write permissions and try again:<\/p>\n<p> \t\t\t\t\t\t\t\t<code>cd \/<\/code><br \/> \t\t\t\t\t\t\t\t<code>umount \/sys\/firmware\/efi\/efivars\/<\/code><br \/> \t\t\t\t\t\t\t\t<code>mount -t efivarfs rw \/sys\/firmware\/efi\/efivars\/<\/code><br \/> \t\t\t\t\t\t\t\t<code>cd \/sys\/firmware\/efi\/efivars\/<\/code><br \/> \t\t\t\t\t\t\t\t<code>rm gpu-power-prefs-&hellip;<\/code><\/p>\n<\/li>\n<li>\n<p> \t\t\t\t\t\t\t\tIf this also fails (you still can&rsquo;t erase the file), use <code>chattr<\/code> command to disable file immutability and then erase the file:<\/p>\n<p> \t\t\t\t\t\t\t\t<code>chattr -i &quot;gpu-power-prefs-&hellip;&rdquo;<\/code><br \/> \t\t\t\t\t\t\t\t<code>rm gpu-power-prefs-&hellip;<\/code><\/p>\n<\/li>\n<\/ul>\n<p> \t\t\t\t\t\t<strong>2.3 Create a new gpu-power-prefs-&hellip; file<\/strong><\/p>\n<pre><code>printf &quot;\\x07\\x00\\x00\\x00\\x01\\x00\\x00\\x00&quot; &gt; \/sys\/firmware\/efi\/efivars\/gpu-power-prefs-fa4ce28d-b62f-4c99-9cc3-6815686e30f9 <\/code><\/pre>\n<p> \t\t\t\t\t\t<strong>2.4 Add immutability to the gpu-power-prefs-&hellip; file<\/strong><\/p>\n<p> \t\t\t\t\t\tThis <code>chattr<\/code> command is supposed to lock a file to make it accessible only by &quot;superuser&quot; &#8211; and so that, while booting, your EFI will have no chance to screw up your gpu-power-prefs-&#8230; variable under any circumstances<\/p>\n<pre><code>chattr +i &quot;\/sys\/firmware\/efi\/efivars\/gpu-power-prefs-fa4ce28d-b62f-4c99-9cc3-6815686e30f9&quot; <\/code><\/pre>\n<p> \t\t\t\t\t\t<strong>2.5 Unmount efivars and reboot<\/strong><\/p>\n<p> \t\t\t\t\t\tChange to the root directory to unmount efivars:<\/p>\n<pre><code>cd \/ umount \/sys\/firmware\/efi\/efivars\/ <\/code><\/pre>\n<p> \t\t\t\t\t\tGuarantees that your EFI variables are flushed to efivarfs filesystem. Please unmount it safely before rebooting.<\/p>\n<pre><code>reboot <\/code><\/pre>\n<h3> \t\t\t\t\t\t3 Remove AMD \/ NVIDIA kexts<\/h3>\n<p> \t\t\t\t\t\t<strong>Note<\/strong>: You might need to do this every time you update your OS, since it normally regenerates these kexts. <strong>You may want to favourite this answer<\/strong> for reference so it is accessible from another device when you need it.<\/p>\n<p> \t\t\t\t\t\tAfter disabling the dGPU using Arch, normal boot would hang halfway but safe boot will work.<\/p>\n<p> \t\t\t\t\t\t<strong>3.1 Move AMD \/ NVIDIA kext files to a backup directory<\/strong><\/p>\n<p> \t\t\t\t\t\tRemove all the AMD (or NVIDIA, depending on your card) kext files in the Terminal in Recovery Console. Trying to remove them in Single User just gives sandbox errors, so don&rsquo;t do it in Single User Mode! (the one that you boot with <kbd>cmd<\/kbd>+<kbd>s<\/kbd>).<\/p>\n<ul>\n<li> \t\t\t\t\t\t\tIf you have FileVault, unlock it first.<\/li>\n<li> \t\t\t\t\t\t\tBoot into Recovery (<kbd>cmd<\/kbd>+<kbd>r<\/kbd>) directly. If it fails, then repeat step 2 and retry (dGPU could get active again after booting into the os with AMD \/ NVIDIA kexts).<\/li>\n<li>\n<p> \t\t\t\t\t\t\t\tStart Terminal (This commands are for AMD. If you have NVIDIA, change accordingly)<\/p>\n<p> \t\t\t\t\t\t\t\t<code>diskutil cs list<\/code> (find Logical Volume UUID: last item)<br \/> \t\t\t\t\t\t\t\t<code>diskutil coreStorage unlockVolume UUID<\/code> (UUID: from previous command)<br \/> \t\t\t\t\t\t\t\t<code>cd \/Volumes\/Macintosh\\ HD<\/code><br \/> \t\t\t\t\t\t\t\t<code>mkdir AMD_Kexts<\/code><br \/> \t\t\t\t\t\t\t\t<code>mv System\/Library\/Extensions\/AMD*.* AMD_Kexts\/<\/code><br \/> \t\t\t\t\t\t\t\t<code>reboot<\/code><\/p>\n<\/li>\n<\/ul>\n<p> \t\t\t\t\t\tI found the procedure in <a href=\"https:\/\/forums.macrumors.com\/threads\/force-2011-macbook-pro-8-2-with-failed-amd-gpu-to-always-use-intel-integrated-gpu-efi-variable-fix.2037591\/page-5#post-24511780\" rel=\"noreferrer\">this link<\/a>, where you can read the attribution of the different sections and a discussion thread on the topic.<\/p>\n<p> \t\t\t\t\t\tI tried it myself on an early 2011 MacBook Pro with a faulty discrete graphics card, that was unable to boot even with the overheating trick, and ended up with a fully functional computer!<\/p>\n<\/p><\/div>\n<div class=\"grid mb0 fw-wrap ai-start jc-end gs8 gsy\">\n<div class=\"grid--cell mr16\" style=\"flex: 1 1 100px;\">\n<div class=\"post-menu\"> \t\t\t\t\t\t\t<a class=\"short-link\" href=\"https:\/\/apple.stackexchange.com\/a\/285896\" id=\"link-post-285896\" title=\"short permalink to this answer\">share<\/a><a class=\"suggest-edit-post\" href=\"https:\/\/apple.stackexchange.com\/posts\/285896\/edit\" title=\"\">improve this answer<\/a><\/div>\n<\/p><\/div>\n<div class=\"post-signature grid--cell fl0\">\n<div class=\"user-info \">\n<div class=\"user-action-time\" style=\"margin-left: 0px !important;\"> \t\t\t\t\t\t\t\t<a href=\"https:\/\/apple.stackexchange.com\/posts\/285896\/revisions\" title=\"show all edits to this post\">edited <span class=\"relativetime\" title=\"2018-04-18 01:55:33Z\">Apr 18 at 1:55<\/span><\/a><\/div>\n<div class=\"user-gravatar32 wb-hat-checked\">\n<div class=\"hat\" data-hatid=\"466042208\" style=\"float: left; display: block; width: 0px; height: 0px; overflow: visible; position: relative; left: 12px; top: 3px;\"> \t\t\t\t\t\t\t\t\t<a href=\"https:\/\/apple.stackexchange.com\/users\/135238\/pang\" style=\"display: inline;\"><img loading=\"lazy\" decoding=\"async\" height=\"27\" 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style=\"display: block;\" width=\"19\" \/><\/a><\/div>\n<div class=\"gravatar-wrapper-32\"> \t\t\t\t\t\t\t\t\t<a href=\"https:\/\/apple.stackexchange.com\/users\/135238\/pang\" style=\"display: inline;\"><img loading=\"lazy\" decoding=\"async\" alt=\"\" height=\"32\" src=\"https:\/\/i.stack.imgur.com\/z5AzI.png?s=32&amp;g=1\" width=\"32\" \/><\/a><\/div>\n<\/p><\/div>\n<div class=\"user-details\"> \t\t\t\t\t\t\t\t<a href=\"https:\/\/apple.stackexchange.com\/users\/135238\/pang\">Pang<\/a> \t\t\t\t\t\t\t\t<\/p>\n<div class=\"-flair\"> \t\t\t\t\t\t\t\t\t<span class=\"reputation-score\" dir=\"ltr\" title=\"reputation score \">377<\/span><span title=\"4 silver badges\"><span class=\"badgecount\">4<\/span><\/span><span title=\"7 bronze badges\"><span class=\"badgecount\">7<\/span><\/span><\/div>\n<\/p><\/div>\n<\/p><\/div>\n<\/p><\/div>\n<div class=\"post-signature grid--cell fl0\">\n<div class=\"user-info \">\n<div class=\"user-action-time\"> \t\t\t\t\t\t\t\tanswered <span class=\"relativetime\" title=\"2017-06-05 21:25:16Z\">Jun 5 &#39;17 at 21:25<\/span><\/div>\n<div class=\"user-gravatar32 wb-hat-checked\">\n<div class=\"gravatar-wrapper-32\"> \t\t\t\t\t\t\t\t\t<a href=\"https:\/\/apple.stackexchange.com\/users\/94184\/fnieto-fernando-nieto\"><img loading=\"lazy\" decoding=\"async\" alt=\"\" height=\"32\" src=\"https:\/\/www.gravatar.com\/avatar\/4dd6b7de5b15c3af727f860083c85d86?s=32&amp;d=identicon&amp;r=PG\" width=\"32\" \/><\/a><\/div>\n<\/p><\/div>\n<div class=\"user-details\"> \t\t\t\t\t\t\t\t<a href=\"https:\/\/apple.stackexchange.com\/users\/94184\/fnieto-fernando-nieto\">fnieto &#8211; Fernando Nieto<\/a> \t\t\t\t\t\t\t\t<\/p>\n<div class=\"-flair\"> \t\t\t\t\t\t\t\t\t<span class=\"reputation-score\" dir=\"ltr\" title=\"reputation score \">571<\/span><span title=\"4 silver badges\"><span class=\"badgecount\">4<\/span><\/span><span title=\"8 bronze badges\"><span class=\"badgecount\">8<\/span><\/span><\/div>\n<\/p><\/div>\n<\/p><\/div>\n<\/p><\/div>\n<\/p><\/div>\n<\/p><\/div>\n<div class=\"post-layout--right\">\n<div class=\"comments js-comments-container \" id=\"comments-285896\">\n<ul class=\"comments-list js-comments-list\" data-addlink-disabled=\"true\" data-canpost=\"false\" data-cansee=\"true\" data-comments-unavailable=\"false\" data-remaining-comments-count=\"23\">\n<li class=\"comment js-comment \" data-comment-id=\"361722\" id=\"comment-361722\">\n<div class=\"js-comment-actions comment-actions\">\n<div class=\"comment-score\"> \t\t\t\t\t\t\t\t\t<span class=\"cool\" title=\"number of 'useful comment' votes received\">1<\/span><\/div>\n<\/p><\/div>\n<div class=\"comment-text js-comment-text-and-form\">\n<div class=\"comment-body\" style=\"display: block;\"> \t\t\t\t\t\t\t\t\t<span class=\"comment-copy\">Yes, you are correct, this mac has an NVIDIA card and not an AMD (I was just following the steps without realizing this). However, I still couldn&#39;t get it working, but with another solution proposed for this specific laptop it did work!! <a href=\"https:\/\/github.com\/julian-poidevin\/MBPMid2010_GPUFix\" rel=\"nofollow noreferrer\">MBPMid2010_GPUFix<\/a>. Thanks for your help.<\/span> &ndash;&nbsp;<a class=\"comment-user\" href=\"https:\/\/apple.stackexchange.com\/users\/240918\/taco\" title=\"101 reputation\">Taco<\/a> <span class=\"comment-date\" dir=\"ltr\"><a class=\"comment-link\" href=\"https:\/\/apple.stackexchange.com\/questions\/166876\/macbook-pro-how-to-disable-discrete-gpu-permanently-from-efi#comment361722_285896\"><span class=\"relativetime-clean\" title=\"2017-06-13 09:46:32Z\">Jun 13 &#39;17 at 9:46<\/span><\/a><\/span><\/div>\n<\/p><\/div>\n<\/li>\n<li class=\"comment js-comment \" data-comment-id=\"369970\" id=\"comment-369970\">\n<div class=\"js-comment-actions comment-actions\">\n<div class=\"comment-score\"> \t\t\t\t\t\t\t\t\t<span class=\"cool\" title=\"number of 'useful comment' votes received\">2<\/span><\/div>\n<\/p><\/div>\n<div class=\"comment-text js-comment-text-and-form\">\n<div class=\"comment-body\" style=\"display: block;\"> \t\t\t\t\t\t\t\t\t<span class=\"comment-copy\">Some important info if you have an NVidia rather than an AMD card. The instructions are correct, but the following kexts need to be removed: CUDA.kext GeForce.kext GeForce7xxxGLDriver.bundle GeForceGA.plugin GeForceGLDriver.bundle GeForceVADriver.bundle NVDANV40Hal.kext NVDANV50Hal.kext NVDAResman.kext NVSMU.kext Tested on an early 2011 MBP running 10.12.6.<\/span> &ndash;&nbsp;<a class=\"comment-user\" href=\"https:\/\/apple.stackexchange.com\/users\/130342\/sporker\" title=\"1 reputation\">sporker<\/a> <span class=\"comment-date\" dir=\"ltr\"><a class=\"comment-link\" href=\"https:\/\/apple.stackexchange.com\/questions\/166876\/macbook-pro-how-to-disable-discrete-gpu-permanently-from-efi#comment369970_285896\"><span class=\"relativetime-clean\" title=\"2017-07-28 02:50:42Z\">Jul 28 &#39;17 at 2:50<\/span><\/a><\/span> <span title=\"this comment was edited 1 time\"> <svg aria-hidden=\"true\" class=\"svg-icon va-text-bottom o50 iconPencilSm\" height=\"14\" viewbox=\"0 0 14 14\" width=\"14\"><\/svg><\/span><\/div>\n<\/p><\/div>\n<\/li>\n<\/ul><\/div>\n<\/p><\/div>\n<\/p><\/div>\n<\/p><\/div>\n<\/p><\/div>\n<div class=\"answer\" data-answerid=\"285896\" id=\"answer-285896\" itemscope=\"\" itemtype=\"http:\/\/schema.org\/Answer\">\n<div class=\"post-layout\">\n<div class=\"post-layout--right\">\n<div class=\"comments js-comments-container \" id=\"comments-285896\">\n<ul class=\"comments-list js-comments-list\" data-addlink-disabled=\"true\" data-canpost=\"false\" data-cansee=\"true\" data-comments-unavailable=\"false\" data-remaining-comments-count=\"23\">\n<li class=\"comment js-comment \" data-comment-id=\"369970\" id=\"comment-369970\">\n<div class=\"comment-text js-comment-text-and-form\">\n<div class=\"comment-body\" style=\"display: block;\"> \t\t\t\t\t\t\t\t&nbsp;<\/div>\n<\/p><\/div>\n<\/li>\n<li class=\"comment js-comment \" data-comment-id=\"380668\" id=\"comment-380668\">\n<div class=\"js-comment-actions comment-actions\">\n<div class=\"comment-score\"> \t\t\t\t\t\t\t\t<span class=\"cool\" title=\"number of 'useful comment' votes received\">1<\/span><\/div>\n<\/p><\/div>\n<div class=\"comment-text js-comment-text-and-form\">\n<div class=\"comment-body\" style=\"display: block;\"> \t\t\t\t\t\t\t\t<span class=\"comment-copy\">This worked great for me (early 2011). Thanks a lot.<\/span> &ndash;&nbsp;<a class=\"comment-user\" href=\"https:\/\/apple.stackexchange.com\/users\/109118\/natario\" title=\"139 reputation\">natario<\/a> <span class=\"comment-date\" dir=\"ltr\"><a class=\"comment-link\" href=\"https:\/\/apple.stackexchange.com\/questions\/166876\/macbook-pro-how-to-disable-discrete-gpu-permanently-from-efi#comment380668_285896\"><span class=\"relativetime-clean\" title=\"2017-10-06 13:12:50Z\">Oct 6 &#39;17 at 13:12<\/span><\/a><\/span><\/div>\n<\/p><\/div>\n<\/li>\n<li class=\"comment js-comment \" data-comment-id=\"398261\" id=\"comment-398261\">\n<div class=\"js-comment-actions comment-actions\">\n<div class=\"comment-score\"> \t\t\t\t\t\t\t\t<span class=\"cool\" title=\"number of 'useful comment' votes received\">2<\/span><\/div>\n<\/p><\/div>\n<div class=\"comment-text js-comment-text-and-form\">\n<div class=\"comment-body\" style=\"display: block;\"> \t\t\t\t\t\t\t\t<span class=\"comment-copy\">It took me 3 tries (making sure to repeat step 2) in order to enter Recovery Mode without it freezing, but it finally worked for my Macbook Retina Pro mid-2012 (with Nvidia card). So thanks!<\/span> &ndash;&nbsp;<a class=\"comment-user\" href=\"https:\/\/apple.stackexchange.com\/users\/6278\/huyz\" title=\"545 reputation\">huyz<\/a> <span class=\"comment-date\" dir=\"ltr\"><a class=\"comment-link\" href=\"https:\/\/apple.stackexchange.com\/questions\/166876\/macbook-pro-how-to-disable-discrete-gpu-permanently-from-efi#comment398261_285896\"><span class=\"relativetime-clean\" title=\"2018-01-29 03:45:02Z\">Jan 29 at 3:45<\/span><\/a><\/span><\/div>\n<\/p><\/div>\n<\/li>\n<li class=\"comment js-comment \" data-comment-id=\"421810\" id=\"comment-421810\">\n<div class=\"js-comment-actions comment-actions\">\n<div class=\"comment-score\"> \t\t\t\t\t\t\t\t<span class=\"cool\" title=\"number of 'useful comment' votes received\">2<\/span><\/div>\n<\/p><\/div>\n<div class=\"comment-text js-comment-text-and-form\">\n<div class=\"comment-body\" style=\"display: block;\"> \t\t\t\t\t\t\t\t<span class=\"comment-copy\">For anyone who has a 2013 mac pro retina with an Nvidia dGPU, I found that if I moved just the NVD*.* files in System\/Library\/Extensions then the dGPU wasn&#39;t disabled and that if I moved both those files and the GeF*.* files as suggested by @sporker then the machine worked but a) couldn&#39;t change brightness and b) didn&#39;t dim the display when closed. What worked for me was moving the GeF files and not the NVD files. The nvram method also didn&#39;t work for me and I had to replace &quot;fa4ce28d&quot; with &quot;000fa4ce&quot; but otherwise the archlinux method worked. Can&#39;t tell you how grateful I am for this post.<\/span> &ndash;&nbsp;<a class=\"comment-user\" href=\"https:\/\/apple.stackexchange.com\/users\/184480\/cbartondock\" title=\"101 reputation\">cbartondock<\/a> <span class=\"comment-date\" dir=\"ltr\"><a class=\"comment-link\" href=\"https:\/\/apple.stackexchange.com\/questions\/166876\/macbook-pro-how-to-disable-discrete-gpu-permanently-from-efi#comment421810_285896\"><span class=\"relativetime-clean\" title=\"2018-07-01 01:25:37Z\">Jul 1 at 1:25<\/span><\/a><\/span><\/div>\n<\/p><\/div>\n<\/li>\n<\/ul><\/div>\n<div data-anon=\"true\" data-rep=\"50\" id=\"comments-link-285896\"> \t\t\t\t<a class=\"js-show-link comments-link \" href=\"https:\/\/apple.stackexchange.com\/questions\/166876\/macbook-pro-how-to-disable-discrete-gpu-permanently-from-efi#\" title=\"expand to show all comments on this post\">show <b>23<\/b> more comments<\/a><\/div>\n<\/p><\/div>\n<\/p><\/div>\n<\/p><\/div>\n<p> \t<a name=\"231270\"><\/a><\/p>\n<div class=\"answer\" data-answerid=\"231270\" id=\"answer-231270\" itemscope=\"\" itemtype=\"http:\/\/schema.org\/Answer\">\n<div class=\"post-layout\">\n<div class=\"votecell post-layout--left\">\n<div class=\"vote\"> \t\t\t\t<a class=\"vote-up-off\" title=\"This answer is useful\">up vote<\/a> <span class=\"vote-count-post \" itemprop=\"upvoteCount\">9<\/span> <a class=\"vote-down-off\" title=\"This answer is not useful\">down vote<\/a><\/div>\n<\/p><\/div>\n<div class=\"answercell post-layout--right\">\n<div class=\"post-text\" itemprop=\"text\">\n<h3> \t\t\t\t\tYour Dilemma<\/h3>\n<p> \t\t\t\t\tI&#39;m in full sympathy with your wish &quot;save on battery and reduce heat, without paying the noise cost&quot; of using the discrete graphics card inside a MacBook Pro.<\/p>\n<h3> \t\t\t\t\tWarning<\/h3>\n<p> \t\t\t\t\tBefore you do anything which will disable your display, please make sure you are able to <a href=\"https:\/\/bluishcoder.co.nz\/articles\/mac-ssh.html\" rel=\"nofollow noreferrer\">log in to your MacBook Pro using SSH<\/a> so that you can undo your handiwork. While screen sharing with all graphic cards disabled will probably work at some default resolution, I wouldn&#39;t bet my computer on it.<\/p>\n<h3> \t\t\t\t\tAnswers<\/h3>\n<blockquote>\n<p> \t\t\t\t\t\tWhat will happen if I permanently disable the discrete nVidia graphics card from EFI? Will Mac OS think integrated GPU is the one installed and let me use multiple monitors with it?<\/p>\n<\/blockquote>\n<p> \t\t\t\t\tYou will lose any ability to use an external monitor (under any OS). The external graphics port(s) are wired to the discrete graphics chip.<\/p>\n<p> \t\t\t\t\tMy own MacBook Pro 2011 runs at a stable 60 degrees even under load with minimal fan noise when using the built-in Intel graphics and spikes to full fans (in the 4000 to 6000 RPM range) when under load with the discrete 6750. The problem is real. I too wanted to be able to only use the built-in graphics and drive an external monitor.<\/p>\n<p> \t\t\t\t\tNo way, no how.<\/p>\n<blockquote>\n<p> \t\t\t\t\t\tIs it true that the same EFI doesn&#39;t even show the integrated GPU to other OSes than Mac OSes and you have to trick it somehow to think it&#39;s Mac OS?<\/p>\n<\/blockquote>\n<p> \t\t\t\t\tYes, it&#39;s true. The Intel GPU gets switched off by the MacBook Pro 11,3&#39;s EFI if you boot anything but Mac OS X. You have <a href=\"https:\/\/github.com\/0xbb\/gpu-switch\" rel=\"nofollow noreferrer\">four choices<\/a> if you want to use the integrated Intel chip under alternative OS:<\/p>\n<blockquote>\n<ol>\n<li> \t\t\t\t\t\t\trEFInd version 0.10.0 or above (recommended): <a href=\"http:\/\/www.rodsbooks.com\/refind\" rel=\"nofollow noreferrer\">http:\/\/www.rodsbooks.com\/refind<\/a><\/li>\n<\/ol>\n<p> \t\t\t\t\t\tRecent versions of rEFInd have the &quot;apple_set_os&quot; hack built-in. You can enable it by setting the spoof_osx_version option in your refind.conf.<\/p>\n<ol start=\"2\">\n<li>\n<p> \t\t\t\t\t\t\t\tapple_set_os.efi: <a href=\"https:\/\/github.com\/0xbb\/apple_set_os.efi\" rel=\"nofollow noreferrer\">https:\/\/github.com\/0xbb\/apple_set_os.efi<\/a><\/p>\n<\/li>\n<li>\n<p> \t\t\t\t\t\t\t\ta patched GRUB: <a href=\"https:\/\/lists.gnu.org\/archive\/html\/grub-devel\/2013-12\/msg00442.html\" rel=\"nofollow noreferrer\">https:\/\/lists.gnu.org\/archive\/html\/grub-devel\/2013-12\/msg00442.html<\/a> <a href=\"https:\/\/wiki.archlinux.org\/index.php\/MacBookPro11,x#Getting_the_integrated_intel_card_to_work_on_11.2C3\" rel=\"nofollow noreferrer\">https:\/\/wiki.archlinux.org\/index.php\/MacBookPro11,x#Getting_the_integrated_intel_card_to_work_on_11.2C3<\/a><\/p>\n<\/li>\n<li>\n<p> \t\t\t\t\t\t\t\ta patched Kernel: <a href=\"https:\/\/www.marc.info\/?l=grub-deavel&amp;m=141586614924917&amp;w=2\" rel=\"nofollow noreferrer\">https:\/\/www.marc.info\/?l=grub-deavel&amp;m=141586614924917&amp;w=2<\/a><\/p>\n<\/li>\n<\/ol>\n<\/blockquote>\n<p> \t\t\t\t\tBe careful to plan ahead. If you don&#39;t prepare, you will face a powered-down integrated graphics card and a black screen. Of course you can always go back and boot Mac OS X and start again.<\/p>\n<p> \t\t\t\t\tThe simplest of the choices above would be number two &#8211; to replace the Apple EFI. Unfortunately, it&#39;s the one which could leave you unable to boot up at all at some future date. Apple does not like people to play with EFI and reserves the right to <a href=\"http:\/\/www.forbes.com\/sites\/ewanspence\/2016\/02\/06\/what-caused-iphone-error-53\/\" rel=\"nofollow noreferrer\">brick your device<\/a> for doing so. If you had Apple Care and were still in the warranty period, you might find a shoulder somewhere to cry on. Might. When you change EFI, you also take <a href=\"https:\/\/reverse.put.as\/2015\/05\/29\/the-empire-strikes-back-apple-how-your-mac-firmware-security-is-completely-broken\/\" rel=\"nofollow noreferrer\">security risks<\/a>, i.e. you may make it easier to hack your machine. You need to be able to update to the latest EFI which would remove your patch.<\/p>\n<p> \t\t\t\t\tOption one, <strong>rEFInd<\/strong> puts itself between boot and EFI, which leaves considerable scope for something to go wrong and for you to be left with a brick and a long hard trail back to a working computer. How serious are these issues? Many MacBook Pro owners have <a href=\"http:\/\/www.rodsbooks.com\/refind\/installing.html#osx\" rel=\"nofollow noreferrer\">lost their hard drive<\/a> to rEFInd:<\/p>\n<blockquote>\n<p> \t\t\t\t\t\tNumerous rEFIt bug reports indicate disk corruption problems on disks over about 500 GiB&#8230;.I strongly recommend that you not type <code>sudo bless --info<\/code> to check the status of your installation if you have such a disk, or even if you suspect you might have such a disk. (I&#39;ve seen Advanced Format disks as small as 320 GB.)<\/p>\n<\/blockquote>\n<p> \t\t\t\t\tOption three is relatively easy. Patching grub is a process with which any early Hackintosh owner is quite familiar. Patching Grub works and is easily undoable as the changes are not made at the firmware level. If you patch grub conservatively, the additional grub code is <a href=\"https:\/\/wiki.archlinux.org\/index.php\/MacBookPro11,x#Using_the_MacBook.27s_native_EFI_bootloader_.28recommended.29\" rel=\"nofollow noreferrer\">only enabled by holding option\/alt on boot<\/a>.<\/p>\n<h3> \t\t\t\t\tConclusion<\/h3>\n<p> \t\t\t\t\tIf you prefer using your computer to repairing it, Cody Krieger&#39;s gfxCardStatus in its out-of-the-box configuration looks more and more attractive. If you really want to force gfxCardStatus to run at start Mr. Krieger has participated in <a href=\"https:\/\/github.com\/codykrieger\/gfxCardStatus\/issues\/150\" rel=\"nofollow noreferrer\">an illuminating conversation<\/a>, which has led to switchGPU. <a href=\"https:\/\/github.com\/joachimroeleveld\/switchGPU\" rel=\"nofollow noreferrer\">switchGPU<\/a> presets gfxCardStatus to either discrete or integrated graphics early enough that you can run on integrated graphics when your discrete GPU would otherwise overheat and crash. gfxCardStatus continues to operate normally (i.e. you can switch back to discrete GPU after boot using the gfxCardStatus menu item). There&#39;s no reason to install switchGPU unless you have <a href=\"http:\/\/www.mbp2011.com\/\" rel=\"nofollow noreferrer\">serious hardware issues<\/a> with your discrete GPU which mean you need to keep it turned off all the time.<\/p>\n<h3> \t\t\t\t\tCoda<\/h3>\n<p> \t\t\t\t\tOn reflection, my own situation with the integrated AMD 6750 is bad enough (so hot and loud even after thermal repasting) that I will avail myself of Apple&#39;s extended <a href=\"http:\/\/www.apple.com\/support\/macbookpro-videoissues\/\" rel=\"nofollow noreferrer\">warranty repair program for 2011 MacBook Pro<\/a> with AMD graphics. Marco Arment was probably right to <a href=\"https:\/\/marco.org\/2011\/09\/20\/heat-and-fan-issues-with-2011-15-inch-macbook-pro\" rel=\"nofollow noreferrer\">turn in his 2011 2.2 GHz MBP with 6750 for the 2.0 GHz version with 6490<\/a>. While I considered doing the same thing at the time, I would have had to ship my MBP overseas to change it. Sadly the Retina MacBook Pros appear to continue to <a href=\"https:\/\/marco.org\/2011\/09\/20\/heat-and-fan-issues-with-2011-15-inch-macbook-pro\" rel=\"nofollow noreferrer\">suffer the same heat and noise issues<\/a>. My girlfriend&#39;s 2013 MacBook Pro with only integrated graphics behaves much better.<\/p>\n<p> \t\t\t\t\tOver heat and noise issues with quad core MBP workstations, I&#39;ve given up and bought two Mac Pros (a 2006 and a 2009), upgraded the CPUs to eight core and six core respectively. The 2006 with Apple AMD 5870 installed is nearly silent (much quieter than the 2009) and multitasks better than the MBP 15&quot;. The two silver towers (home and office) cost less combined than a single new MacBook Pro. For now I&#39;m running the 2011 MBP 15&quot; on discrete graphics only as a carry around (no external monitor).<\/p>\n<\/p><\/div>\n<div class=\"grid mb0 fw-wrap ai-start jc-end gs8 gsy\">\n<div class=\"grid--cell mr16\" style=\"flex: 1 1 100px;\">\n<div class=\"post-menu\"> \t\t\t\t\t\t<a class=\"short-link\" href=\"https:\/\/apple.stackexchange.com\/a\/231270\" id=\"link-post-231270\" title=\"short permalink to this answer\">share<\/a><a class=\"suggest-edit-post\" href=\"https:\/\/apple.stackexchange.com\/posts\/231270\/edit\" title=\"\">improve this answer<\/a><\/div>\n<\/p><\/div>\n<div class=\"post-signature grid--cell fl0\">\n<div class=\"user-info \">\n<div class=\"user-action-time\"> \t\t\t\t\t\t\t<a href=\"https:\/\/apple.stackexchange.com\/posts\/231270\/revisions\" title=\"show all edits to this post\">edited <span class=\"relativetime\" title=\"2018-11-09 08:45:29Z\">Nov 9 at 8:45<\/span><\/a><\/div>\n<div class=\"user-gravatar32 wb-hat-checked\">\n<div class=\"gravatar-wrapper-32\"> \t\t\t\t\t\t\t\t<a href=\"https:\/\/apple.stackexchange.com\/users\/73959\/user5910\"><img loading=\"lazy\" decoding=\"async\" alt=\"\" height=\"32\" src=\"https:\/\/www.gravatar.com\/avatar\/d10e692f9b2860dc6401948bf2643f5b?s=32&amp;d=identicon&amp;r=PG\" width=\"32\" \/><\/a><\/div>\n<\/p><\/div>\n<div class=\"user-details\"> \t\t\t\t\t\t\t<a href=\"https:\/\/apple.stackexchange.com\/users\/73959\/user5910\">User5910<\/a> \t\t\t\t\t\t\t<\/p>\n<div class=\"-flair\"> \t\t\t\t\t\t\t\t<span class=\"reputation-score\" dir=\"ltr\" title=\"reputation score \">105<\/span><span title=\"3 bronze badges\"><span class=\"badgecount\">3<\/span><\/span><\/div>\n<\/p><\/div>\n<\/p><\/div>\n<\/p><\/div>\n<div class=\"post-signature grid--cell fl0\">\n<div class=\"user-info \">\n<div class=\"user-action-time\"> \t\t\t\t\t\t\tanswered <span class=\"relativetime\" title=\"2016-03-17 03:35:48Z\">Mar 17 &#39;16 at 3:35<\/span><\/div>\n<div class=\"user-gravatar32 wb-hat-checked\">\n<div class=\"gravatar-wrapper-32\"> \t\t\t\t\t\t\t\t<a href=\"https:\/\/apple.stackexchange.com\/users\/69259\/foliovision\"><img loading=\"lazy\" decoding=\"async\" alt=\"\" height=\"32\" src=\"https:\/\/www.gravatar.com\/avatar\/718167cda697d6ec1d66f274795bf7d0?s=32&amp;d=identicon&amp;r=PG\" width=\"32\" \/><\/a><\/div>\n<\/p><\/div>\n<div class=\"user-details\"> \t\t\t\t\t\t\t<a href=\"https:\/\/apple.stackexchange.com\/users\/69259\/foliovision\">Foliovision<\/a> \t\t\t\t\t\t\t<\/p>\n<div class=\"-flair\"> \t\t\t\t\t\t\t\t<span class=\"reputation-score\" dir=\"ltr\" title=\"reputation score \">789<\/span><span title=\"5 silver badges\"><span class=\"badgecount\">5<\/span><\/span><span title=\"13 bronze badges\"><span class=\"badgecount\">13<\/span><\/span><\/div>\n<\/p><\/div>\n<\/p><\/div>\n<\/p><\/div>\n<\/p><\/div>\n<\/p><\/div>\n<div class=\"post-layout--right\">\n<div data-anon=\"true\" data-rep=\"50\" id=\"comments-link-231270\"> \t\t\t\t<a class=\"js-add-link comments-link disabled-link \" title=\"Use comments to ask for more information or suggest improvements. Avoid comments like \u201c+1\u201d or \u201cthanks\u201d.\">add a comment<\/a><\/div>\n<\/p><\/div>\n<\/p><\/div>\n<\/p><\/div>\n<p> \t<a name=\"297114\"><\/a><\/p>\n<div class=\"answer\" data-answerid=\"297114\" id=\"answer-297114\" itemscope=\"\" itemtype=\"http:\/\/schema.org\/Answer\">\n<div class=\"post-layout\">\n<div class=\"votecell post-layout--left\">\n<div class=\"vote\"> \t\t\t\t<a class=\"vote-up-off\" title=\"This answer is useful\">up vote<\/a> <span class=\"vote-count-post \" itemprop=\"upvoteCount\">4<\/span> <a class=\"vote-down-off\" title=\"This answer is not useful\">down vote<\/a><\/div>\n<\/p><\/div>\n<div class=\"answercell post-layout--right\">\n<div class=\"post-text\" itemprop=\"text\">\n<p> \t\t\t\t\t<strong>Your planned procedure is possible. Your planned procedure is not that difficult. Your planned procedure is not the best option.<\/strong><\/p>\n<p> \t\t\t\t\t<strong>Why this route is suboptimal<\/strong><\/p>\n<p> \t\t\t\t\tMacBook Pros will and have to switch to discrete GPU (dGPU) once an external display is connected. Therefore, an installed but disabled dGPU takes away the option to use an external Monitor with that dGPU.<\/p>\n<p> \t\t\t\t\tThere are other options now, like using USB solutions or external GPUs (eGPU). But setting the EFI variable you are looking for will definitely disable direct output with one cable from the Thunderbolt port to an external monitor.<\/p>\n<p> \t\t\t\t\t<strong>How you can disable the discrete GPU from EFI?<\/strong><\/p>\n<p> \t\t\t\t\tThe command you mentioned in your update is almost correct. It just misses the proper identifier:<\/p>\n<p> \t\t\t\t\t<code>sudo nvram fa4ce28d-b62f-4c99-9cc3-6815686e30f9:gpu-power-prefs=%01%00%00%00<\/code><\/p>\n<p> \t\t\t\t\tThis writes the corresponding EFI variable to NVRAM and forces the MacBook Pro to always boot straight into integrated GPU (iGPU). The identifier is not only for AMD dGPUs but all dGPUs. This is confirmed to work with NVidia chips alike. It is also easily reversible with an NVRAM reset.<\/p>\n<p> \t\t\t\t\t<strong>Disadvantages of this strategy in this situation<\/strong><\/p>\n<p> \t\t\t\t\tAnd now the downside: There are potentially two little problems with this:<\/p>\n<ol>\n<li>\n<p> \t\t\t\t\t\t\tAfter you force these NVRAM settings macOS might get &quot;a little bit confused&quot;. The chip is still there, wired and powered.<\/p>\n<\/li>\n<li>\n<p> \t\t\t\t\t\t\tTo get this to boot you <em>might<\/em> need to disable the graphics drivers for your dGPU. Or at least the one kext that manages the actual graphics switching. The boot might hang when trying to initiate GPU switching otherwise.<\/p>\n<\/li>\n<\/ol>\n<p> \t\t\t\t\tBoth newly arisen problems can be dealt with by moving either all NVidia kexts out of <code>\/System\/Library\/Extensions<\/code> to a safe backup place. <em>This will boot<\/em> the machine forced into accelerated iGPU mode. But setting an EFI variable might not be enough to get sensible power management. For that you will likely have to move back the NVidia kexts <em>except<\/em> those responsible for graphics switching. Failing to do so will lead to needlessly high power on the dGPU. It will at least idle at &quot;full power&#39; (translated to &gt;~60&deg;C).<\/p>\n<p> \t\t\t\t\tThis high power idle will potentially be the great defeat for your plan to reduce fan noise and increase battery. Side note from the literature: It should be a truth universally acknowledged that moving kexts around also requires that you disable SIP on newer versions of OS X\/macOS as long as you move things like this around.<\/p>\n<p> \t\t\t\t\tGeneral stratedy to find the kexts to experiment with: boot <em>without<\/em> the NVRAM variable in a stock system (with &#39;default&#39; NVidia kexts). Then take note of which extensions your system actually loads with <code>kextstat<\/code>. Then reboot with previously loaded NVidia\/Geforce kexts moved away and the hack enabled. Get a detailed sensor monitor (iStatMenus, TGPro, etc&hellip;) and watch the temperature on and around the GPU. Now load one after the other of the relevant kexts back into the kernel with <code>sudo kextload \/path-to\/NVDA***.kext<\/code>. Wait one or two minutes after each.<\/p>\n<p> \t\t\t\t\tSince the method of this post &ndash; or the equally valid but looong way: manipulating EFIvars in Linux &ndash; is NVRAM, it will revert cleanly if you do an SMC\/NVRAM reset. That NVRAM hacking is actually the only part of this post that for sure will <em>not<\/em> give you much trouble.<\/p>\n<p> \t\t\t\t\tDoing this NVRAM reset restores a minimal set of factory settings to EFI variables\/NVRAM. That factory setting will not be touched.<\/p>\n<p> \t\t\t\t\tThis can be done as often as you like.<\/p>\n<p> \t\t\t\t\tIn Linux the driver system is much better documented and imho implemented cleaner. There are many ways to achieve this with or booting into Linux. And a Linux (whether respecting this NVRAM\/EFIvars setting or through other methods) will give you much less trouble with drivers (Who&#39;d have thought). For other OSes, like Microsoft Windows, I have no data.<\/p>\n<p> \t\t\t\t\t<strong>To repeat: Having the OS not recognise the dGPU properly does not mean it is powered off. That <em>might<\/em> lead to unwanted thermal side effects.<\/strong><\/p>\n<p> \t\t\t\t\tTake a look at <a href=\"https:\/\/apple.stackexchange.com\/a\/295805\/251859\">this guide for 2011 MacBook Pros<\/a> for a similar solution and a little bit more options; also to quickly undo <em>and<\/em> redo the NVRAM hack.<\/p>\n<p> \t\t\t\t\t<strong>Multiple monitors and a disabled dGPU<\/strong><\/p>\n<p> \t\t\t\t\t<strong>Having said that all: <a href=\"https:\/\/github.com\/steveschow\/gfxCardStatus\" rel=\"nofollow noreferrer\">gfxCardStatus<\/a> (or try different versions of the original &ndash; they have different options\/capabilities&hellip;) is imho the best option if you do not have real hardware issues to deal with. <em>It&#39;s much more flexible and you can still switch back to dGPU or external monitors quite easily within a running system.<\/em><\/strong><\/p>\n<p> \t\t\t\t\tWhether via EFI\/NVRAM or with gfxCardStatus: forcing a Mac with switchable graphics to integrated-only will <em>disable<\/em> external display modes using the built-in DisplayPort or Thunderbolt graphics output. This is a consequence of the hardware design which routes the display signal for external monitors <em>through<\/em> the dGPU. Using not discrete but external graphics adapters might be a workaround for that limitation.<\/p>\n<p> \t\t\t\t\t<strong>The EFI setting to enable integrated on other operating systems<\/strong><\/p>\n<p> \t\t\t\t\tAs should be clear by now, the EFI setting to allow other operating systems like Linux to &quot;see&quot; a switchable graphics setup is different from the above that <em>disables<\/em> the dGPU. <a href=\"https:\/\/github.com\/0xbb\/apple_set_os.efi\" rel=\"nofollow noreferrer\">Tiny EFI program for unlocking the Intel IGD on the Macbook Pro 11,3 for Linux and Windows:<\/a><\/p>\n<blockquote>\n<p> \t\t\t\t\t\tTiny EFI program for unlocking the Intel IGD on the Macbook Pro 11,3 for Linux and Windows. It has been made to be easily chainloaded by unmodified EFI bootloader like Grub, rEFInd etc.<\/p>\n<p> \t\t\t\t\t\tThe Macbook Pro 11,3 model&#39;s EFI is switching off the Intel GPU if you boot anything but Mac OS X. So a little trick by faking the OS identifiction is required to make all hardware accessible.<\/p>\n<p> \t\t\t\t\t\tAll credits belong to Andreas Heider who originally discovered this hack: <a href=\"https:\/\/lists.gnu.org\/archive\/html\/grub-devel\/2013-12\/msg00442.html\" rel=\"nofollow noreferrer\">https:\/\/lists.gnu.org\/archive\/html\/grub-devel\/2013-12\/msg00442.html<\/a><\/p>\n<\/blockquote><\/div>\n<div class=\"grid mb0 fw-wrap ai-start jc-end gs8 gsy\">\n<div class=\"grid--cell mr16\" style=\"flex: 1 1 100px;\">\n<div class=\"post-menu\"> \t\t\t\t\t\t<a class=\"short-link\" href=\"https:\/\/apple.stackexchange.com\/a\/297114\" id=\"link-post-297114\" title=\"short permalink to this answer\">share<\/a><a class=\"suggest-edit-post\" href=\"https:\/\/apple.stackexchange.com\/posts\/297114\/edit\" title=\"\">improve this answer<\/a><\/div>\n<\/p><\/div>\n<div class=\"post-signature grid--cell fl0\">\n<div class=\"user-info \">\n<div class=\"user-action-time\"> \t\t\t\t\t\t\t<a href=\"https:\/\/apple.stackexchange.com\/posts\/297114\/revisions\" title=\"show all edits to this post\">edited <span class=\"relativetime\" title=\"2018-12-08 18:05:56Z\">Dec 8 at 18:05<\/span><\/a><\/div>\n<div class=\"user-gravatar32 wb-hat-checked\"> \t\t\t\t\t\t\t&nbsp;<\/div>\n<div class=\"user-details\">\n<div class=\"-flair\"> \t\t\t\t\t\t\t\t&nbsp;<\/div>\n<\/p><\/div>\n<\/p><\/div>\n<\/p><\/div>\n<div class=\"post-signature grid--cell fl0\">\n<div class=\"user-info user-hover\">\n<div class=\"user-action-time\" style=\"margin-left: 0px !important;\"> \t\t\t\t\t\t\tanswered <span class=\"relativetime\" title=\"2017-09-01 13:41:18Z\">Sep 1 &#39;17 at 13:41<\/span><\/div>\n<div class=\"user-gravatar32 wb-hat-checked\">\n<div class=\"hat\" data-hatid=\"466042208\" style=\"float: left; display: block; width: 0px; height: 0px; overflow: visible; position: relative; left: -4px; top: 1px;\"> \t\t\t\t\t\t\t\t<a href=\"https:\/\/apple.stackexchange.com\/users\/251859\/langlangc\" 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style=\"display: block;\" width=\"40\" \/><\/a><\/div>\n<div class=\"gravatar-wrapper-32\"> \t\t\t\t\t\t\t\t<a href=\"https:\/\/apple.stackexchange.com\/users\/251859\/langlangc\" style=\"display: inline;\"><img loading=\"lazy\" decoding=\"async\" alt=\"\" height=\"32\" src=\"https:\/\/i.stack.imgur.com\/ONEAb.png?s=32&amp;g=1\" width=\"32\" \/><\/a><\/div>\n<\/p><\/div>\n<div class=\"user-details\"> \t\t\t\t\t\t\t<a href=\"https:\/\/apple.stackexchange.com\/users\/251859\/langlangc\">LangLangC<\/a> \t\t\t\t\t\t\t<\/p>\n<div class=\"-flair\"> \t\t\t\t\t\t\t\t<span class=\"reputation-score\" dir=\"ltr\" title=\"reputation score \">3,817<\/span><span title=\"3 gold badges\"><span class=\"badgecount\">3<\/span><\/span><span title=\"12 silver badges\"><span class=\"badgecount\">12<\/span><\/span><span title=\"51 bronze badges\"><span class=\"badgecount\">51<\/span><\/span><\/div>\n<\/p><\/div>\n<\/p><\/div>\n<\/p><\/div>\n<\/p><\/div>\n<\/p><\/div>\n<div class=\"post-layout--right\">\n<div data-anon=\"true\" data-rep=\"50\" id=\"comments-link-297114\"> \t\t\t\t<a class=\"js-add-link comments-link disabled-link \" title=\"Use comments to ask for more information or suggest improvements. Avoid comments like \u201c+1\u201d or \u201cthanks\u201d.\">add a comment<\/a><\/div>\n<\/p><\/div>\n<\/p><\/div>\n<\/p><\/div>\n<p> \t<a name=\"196709\"><\/a><\/p>\n<div class=\"answer\" data-answerid=\"196709\" id=\"answer-196709\" itemscope=\"\" itemtype=\"http:\/\/schema.org\/Answer\">\n<div class=\"post-layout\">\n<div class=\"votecell post-layout--left\">\n<div class=\"vote\"> \t\t\t\t<a class=\"vote-up-off\" title=\"This answer is useful\">up vote<\/a> <span class=\"vote-count-post \" itemprop=\"upvoteCount\">2<\/span> <a class=\"vote-down-off\" title=\"This answer is not useful\">down vote<\/a><\/div>\n<\/p><\/div>\n<div class=\"answercell post-layout--right\">\n<div class=\"post-text\" itemprop=\"text\">\n<p> \t\t\t\t\tBelated answer to one of your side questions: You probably need the discrete GPU enabled to use an external display. The reason why should be in how the GPUs and the video outputs are wired.<\/p>\n<p> \t\t\t\t\t(I&#39;m half-guessing, half-extrapolating from how the PC laptop graphics switching technology works. It&#39;s not an unreasonable assumption that those technologies are based on the GPU vendors&#39; work with Apple. Still: take the following with a large grain of salt.)<\/p>\n<p> \t\t\t\t\tWith nVidia Optimus, the setup is that the built-in display of a laptop is connected to the integrated GPU, and the external display port is connected to the discrete GPU. If you need to render stuff using the discrete GPU to the built-in display, the discrete GPU is &quot;slaved&quot; to the integrated one. A rendering call first goes to the integrated GPU, which, if the discrete GPU is enabled, forwards it there, then retrieves the result to push it on the display.<\/p>\n<p> \t\t\t\t\tIf an external display is connected, rendering calls for that display go directly to the discrete GPU, because that&#39;s the GPU that can send any output to that display anyway. The integrated GPU simply can not, at all, send video output to that port on its own. I don&#39;t think it&#39;s even possible to have the integrated GPU be &quot;slaved&quot; to the discrete one, because first of all it&#39;d be pointless from a design perspective with regards to the goals of the graphics switching technology; and even then, it&#39;d still require the discrete GPU to be enabled, which wouldn&#39;t help people whose chip is failing.<\/p>\n<\/p><\/div>\n<div class=\"grid mb0 fw-wrap ai-start jc-end gs8 gsy\">\n<div class=\"grid--cell mr16\" style=\"flex: 1 1 100px;\">\n<div class=\"post-menu\"> \t\t\t\t\t\t<a class=\"short-link\" href=\"https:\/\/apple.stackexchange.com\/a\/196709\" id=\"link-post-196709\" title=\"short permalink to this answer\">share<\/a><a class=\"suggest-edit-post\" href=\"https:\/\/apple.stackexchange.com\/posts\/196709\/edit\" title=\"\">improve this answer<\/a><\/div>\n<\/p><\/div>\n<div class=\"post-signature grid--cell fl0\">\n<div class=\"user-info \">\n<div class=\"user-action-time\"> \t\t\t\t\t\t\tanswered <span class=\"relativetime\" title=\"2015-07-20 21:09:22Z\">Jul 20 &#39;15 at 21:09<\/span><\/div>\n<div class=\"user-gravatar32 wb-hat-checked\">\n<div class=\"gravatar-wrapper-32\"> \t\t\t\t\t\t\t\t<a href=\"https:\/\/apple.stackexchange.com\/users\/25614\/millimoose\"><img loading=\"lazy\" decoding=\"async\" alt=\"\" height=\"32\" src=\"https:\/\/www.gravatar.com\/avatar\/430ea1cba106cc65b7687d66e9df4f06?s=32&amp;d=identicon&amp;r=PG\" width=\"32\" \/><\/a><\/div>\n<\/p><\/div>\n<div class=\"user-details\"> \t\t\t\t\t\t\t<a href=\"https:\/\/apple.stackexchange.com\/users\/25614\/millimoose\">millimoose<\/a> \t\t\t\t\t\t\t<\/p>\n<div class=\"-flair\"> \t\t\t\t\t\t\t\t<span class=\"reputation-score\" dir=\"ltr\" title=\"reputation score \">121<\/span><span title=\"4 bronze badges\"><span class=\"badgecount\">4<\/span><\/span><\/div>\n<\/p><\/div>\n<\/p><\/div>\n<\/p><\/div>\n<\/p><\/div>\n<\/p><\/div>\n<div class=\"post-layout--right\">\n<div class=\"comments js-comments-container \" id=\"comments-196709\">\n<ul class=\"comments-list js-comments-list\" data-addlink-disabled=\"true\" data-canpost=\"false\" data-cansee=\"true\" data-comments-unavailable=\"false\" data-remaining-comments-count=\"0\">\n<li class=\"comment js-comment \" data-comment-id=\"235112\" id=\"comment-235112\">\n<div class=\"js-comment-actions comment-actions\">\n<div class=\"comment-score\"> \t\t\t\t\t\t\t\t&nbsp;<\/div>\n<\/p><\/div>\n<div class=\"comment-text js-comment-text-and-form\">\n<div class=\"comment-body\" style=\"display: block;\"> \t\t\t\t\t\t\t\t<span class=\"comment-copy\">Interesting! I know that Lenovo ThinkPad W530 allowed me to set integrated GPU from BIOS options, and I&#39;m almost sure this still let me hook external monitors still. Not 100% sure as well.<\/span> &ndash;&nbsp;<a class=\"comment-user owner\" href=\"https:\/\/apple.stackexchange.com\/users\/22634\/meligy\" title=\"311 reputation\">Meligy<\/a> <span class=\"comment-date\" dir=\"ltr\"><a class=\"comment-link\" href=\"https:\/\/apple.stackexchange.com\/questions\/166876\/macbook-pro-how-to-disable-discrete-gpu-permanently-from-efi#comment235112_196709\"><span class=\"relativetime-clean\" title=\"2015-07-21 04:47:17Z\">Jul 21 &#39;15 at 4:47<\/span><\/a><\/span><\/div>\n<\/p><\/div>\n<\/li>\n<li class=\"comment js-comment \" data-comment-id=\"236273\" id=\"comment-236273\">\n<div class=\"js-comment-actions comment-actions\">\n<div class=\"comment-score\"> \t\t\t\t\t\t\t\t&nbsp;<\/div>\n<\/p><\/div>\n<div class=\"comment-text js-comment-text-and-form\">\n<div class=\"comment-body\" style=\"display: block;\"> \t\t\t\t\t\t\t\t<span class=\"comment-copy\">As I said, I&#39;m not 100% certain on the above, because I can&#39;t find the original articles again. It&#39;s possible that the wiring I described isn&#39;t the only possible configuration, and the W530 has the integrated GPU handle both. However, the Macbook requiring you to run the discrete GPU for an external would indicate that it&#39;s indeed wired the way I described.<\/span> &ndash;&nbsp;<a class=\"comment-user\" href=\"https:\/\/apple.stackexchange.com\/users\/25614\/millimoose\" title=\"121 reputation\">millimoose<\/a> <span class=\"comment-date\" dir=\"ltr\"><a class=\"comment-link\" href=\"https:\/\/apple.stackexchange.com\/questions\/166876\/macbook-pro-how-to-disable-discrete-gpu-permanently-from-efi#comment236273_196709\"><span class=\"relativetime-clean\" title=\"2015-07-26 23:40:48Z\">Jul 26 &#39;15 at 23:40<\/span><\/a><\/span><\/div>\n<\/p><\/div>\n<\/li>\n<li class=\"comment js-comment \" data-comment-id=\"397300\" id=\"comment-397300\">\n<div class=\"js-comment-actions comment-actions\">\n<div class=\"comment-score\"> \t\t\t\t\t\t\t\t&nbsp;<\/div>\n<\/p><\/div>\n<div class=\"comment-text js-comment-text-and-form\">\n<div class=\"comment-body\" style=\"display: block;\"> \t\t\t\t\t\t\t\t<span class=\"comment-copy\">You do need the discrete GPU to use an external display. Using the discrete GPU regularly will generate more fan noise and shorten the life of your motherboard. I no longer use the discrete GPU at all. I use a desktop for heavy lifting but still enjoy the big 17 inch built-in screen when travelling.<\/span> &ndash;&nbsp;<a class=\"comment-user\" href=\"https:\/\/apple.stackexchange.com\/users\/69259\/foliovision\" title=\"789 reputation\">Foliovision<\/a> <span class=\"comment-date\" dir=\"ltr\"><a class=\"comment-link\" href=\"https:\/\/apple.stackexchange.com\/questions\/166876\/macbook-pro-how-to-disable-discrete-gpu-permanently-from-efi#comment397300_196709\"><span class=\"relativetime-clean\" title=\"2018-01-22 20:39:13Z\">Jan 22 at 20:39<\/span><\/a><\/span><\/div>\n<\/p><\/div>\n<\/li>\n<\/ul><\/div>\n<div data-anon=\"true\" data-rep=\"50\" id=\"comments-link-196709\"> \t\t\t\t<a class=\"js-add-link comments-link disabled-link \" title=\"Use comments to ask for more information or suggest improvements. Avoid comments like \u201c+1\u201d or \u201cthanks\u201d.\">add a comment<\/a><\/div>\n<\/p><\/div>\n<\/p><\/div>\n<\/p><\/div>\n<p> \t<a name=\"284398\"><\/a><\/p>\n<div class=\"answer\" data-answerid=\"284398\" id=\"answer-284398\" itemscope=\"\" itemtype=\"http:\/\/schema.org\/Answer\">\n<div class=\"post-layout\">\n<div class=\"votecell post-layout--left\">\n<div class=\"vote\"> \t\t\t\t<a class=\"vote-up-off\" title=\"This answer is useful\">up vote<\/a> <span class=\"vote-count-post \" itemprop=\"upvoteCount\">2<\/span> <a class=\"vote-down-off\" title=\"This answer is not useful\">down vote<\/a><\/div>\n<\/p><\/div>\n<div class=\"answercell post-layout--right\">\n<div class=\"post-text\" itemprop=\"text\">\n<p> \t\t\t\t\tIf anyone is still looking for ways to do this, please check out this MacRumors forum post.<\/p>\n<p> \t\t\t\t\tI followed the steps mentioned in that forum post and my 15&quot; MacBook Pro 2011 is working perfectly using only its Integrated Graphic. The worthless AMD graphic card was disabled successfully.<\/p>\n<p> \t\t\t\t\t<a href=\"https:\/\/forums.macrumors.com\/threads\/force-2011-macbook-pro-8-2-with-failed-amd-gpu-to-always-use-intel-integrated-gpu-efi-variable-fix.2037591\/page-5#post-24511780\" rel=\"nofollow noreferrer\">https:\/\/forums.macrumors.com\/threads\/force-2011-macbook-pro-8-2-with-failed-amd-gpu-to-always-use-intel-integrated-gpu-efi-variable-fix.2037591\/page-5#post-24511780<\/a><\/p>\n<p> \t\t\t\t\t<a href=\"https:\/\/forums.macrumors.com\/threads\/force-2011-macbook-pro-8-2-with-failed-amd-gpu-to-always-use-intel-integrated-gpu-efi-variable-fix.2037591\/\" rel=\"nofollow noreferrer\">https:\/\/forums.macrumors.com\/threads\/force-2011-macbook-pro-8-2-with-failed-amd-gpu-to-always-use-intel-integrated-gpu-efi-variable-fix.2037591\/<\/a><\/p>\n<\/p><\/div>\n<\/p><\/div>\n<\/p><\/div>\n<\/p><\/div>\n","protected":false},"excerpt":{"rendered":"<p>I&#39;d like to disable the NVidia GTX 750M GPU on my MacBook Pro 15&quot; (Retina, Mid 2014, Mac OS X 10.10 Yosemite). I know I can use GfxCardStatus but I read I could have a more permanent solution by changing some EFI flag. My question is: How can I disable the discrete GPU from EFI?&#8230;<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[3],"tags":[],"class_list":["post-346","post","type-post","status-publish","format-standard","hentry","category-how-to-s"],"_links":{"self":[{"href":"https:\/\/notiz.comanet.xyz\/index.php?rest_route=\/wp\/v2\/posts\/346","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/notiz.comanet.xyz\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/notiz.comanet.xyz\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/notiz.comanet.xyz\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/notiz.comanet.xyz\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=346"}],"version-history":[{"count":1,"href":"https:\/\/notiz.comanet.xyz\/index.php?rest_route=\/wp\/v2\/posts\/346\/revisions"}],"predecessor-version":[{"id":360,"href":"https:\/\/notiz.comanet.xyz\/index.php?rest_route=\/wp\/v2\/posts\/346\/revisions\/360"}],"wp:attachment":[{"href":"https:\/\/notiz.comanet.xyz\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=346"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/notiz.comanet.xyz\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=346"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/notiz.comanet.xyz\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=346"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}