Download the latest Arch Linux ISO image.You need a working computer for that and a spare CD/DVD/USB drive.Prepare a Bootable USB pendrive with a non GUI Linux Searching in internet, I stepped into this GitHub issue 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 cmd+ s): sudo nvram fa4ce28d-b62f-4c99-9cc3-6815686e30f9:gpu-power-prefs=%01%00%00%00ġ. The 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. You can permanently disable discrete graphics card following next steps: UPDATE! Try to edit NVRAM variable from Single-User mode Is that true? And if yes, how to do that? I 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's macOS. If 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? If you force integrated graphics in GfxCardStatus, Mac OS X (up to Yosemite at least) doesn't allow you to use multiple monitors (even though the built in Iris Pro can do it). The question is basically whether the command mentioned in GfxCardStatus github issue comment here is correct or not, and how to undo it if it doesn't work.Īn answer to this alone is a correct answer, but it'll be awesome if you can also tell me: I'd also want to know how to undo it if needed. I assume this is persistent across multiple reboots. How can I disable the discrete GPU from EFI? I know I can use GfxCardStatus but I read I could have a more permanent solution by changing some EFI flag. on an incompatible machine the software has no effect but it does allow for install and be ready to run when booting a compatible machine).I'd like to disable the NVidia GTX 750M GPU on my MacBook Pro 15" (Retina, Mid 2014, Mac OS X 10.10 Yosemite). (iii) Allow for install on another computer even if that other computer is not a compatible machine (i.e. (ii) Allow for install in “target disk mode on another machine Allow or install on in single-user mode (that works) How can I install gfxCardStatus when I cannot get the machine to boot? I had previously found this online: where a manual procedur is posted. Is gfxCardStatus indeed a possible solution by forcing the use of “integrated only” early enough in the process to allow boot to complete? I have the following questions for the author (and thank you for developing this software in the first place). Reading this post, the issue seems to be the same as the one reported by ttrtilley (and others). It would be great if we could use gfxCardStatus to always force the usage of the internal GPU.Ī genius bar rep suggested gfxCardStatus because my video card is bad and the system crashes before it completes the boot. Note: if I let the ATI* and AMD* extensions in place, my MBP freezes during the boot sequence Today gfxCardStatus is used by a lot of the owners of early 2011 MBPs who have troubles with the external Radeon GPU.įor example, to be able to boot my MBP 8.2, I must remove the ATI* and AMD* extensions, but in this case, the selected GPU is the Radeon GPU and gfxCardStatus is not able to force the usage of the integrated GPU because it detects an external display even I have no plugged external display !. Ogattaz gives an excellent description of this problem in: This problem also occurs when booted "Safe Mode". kext files to get it to boot all the way to login screen. Strangely enough, it DOES allow "Discrete Only" and also allows Dynamic.
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