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1. #2018 what is sharing option for on my mac book pro how to#
2. #2018 what is sharing option for on my mac book pro mac os x#
3. #2018 what is sharing option for on my mac book pro upgrade#
4. #2018 what is sharing option for on my mac book pro iso#
5. #2018 what is sharing option for on my mac book pro download#

This chattr command is supposed to lock a file to make it accessible only by "superuser" - and so that, while booting, your EFI will have no chance to screw up your gpu-power-prefs. If this also fails (you still can’t erase the file), use chattr command to disable file immutability and then erase the file:Ģ.3 Create a new gpu-power-prefs-… file printf "\x07\x00\x00\x00\x01\x00\x00\x00" > /sys/firmware/efi/efivars/gpu-power-prefs-fa4ce28d-b62f-4c99-9cc3-6815686e30f9Ģ.4 Add immutability to the gpu-power-prefs-… file

Mount -t efivarfs rw /sys/firmware/efi/efivars/ If you are getting the "operation not permitted" message while attempting to rm, it means that efivarfs has been mounted as read-only and you need to remount it with read-write permissions and try again: If there is such a variable, it's better to remove it with rm. Looks like efivarfs filesystem is mounted by default! So you can already cd /sys/firmware/efi/efivars and ls to explore this directory and see if there is a gpu-power-prefs.

#2018 what is sharing option for on my mac book pro iso#

Now copy the ISO image file to the device. 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 /dev/diskX.Ī USB device is normally auto-mounted in macOS, and you have to unmount (not eject) it before block-writing to it with dd: Your USB device will appear as something like /dev/disk2 (external, physical). Open /Applications/Utilities/Terminal in MacOS and list all storage devices:

#2018 what is sharing option for on my mac book pro download#

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.

#2018 what is sharing option for on my mac book pro upgrade#

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

#2018 what is sharing option for on my mac book pro how to#

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?

#2018 what is sharing option for on my mac book pro mac os x#

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. I'd like to disable the NVidia GTX 750M GPU on my MacBook Pro 15" (Retina, Mid 2014, Mac OS X 10.10 Yosemite).