MacBook Pro GPU AMD Failure Method 2

MacBook Pro GPU AMD Failure Method 2

As detailed in the post over there, a friend had an issue with MacBook pro with the GPU AMD failing. A few months later it  wouldn’t even boot. Couldn’t even get it into single user mode.

So, how did I get it working again. Well first of all I had a USB stick with a non-GUI version of Linux, I used ArchLinux. I won’t go into the details here, but I did have issues copying the ISO of ArchLinux onto a USB stick using my own Mac. You can see how I did this here.

WARNING – these worked for me, they may not work for you, ensure you take a full back up before performing any of these tasks, the read only disk image will be faster, but the read-write is better, it still took me two days to perform a backup for a 500GB disk. If your Time Machine is available, use that. The author of CheekyFactor.com will not be held liable for loss of data or broken machines. Do not perform these tasks if you are a novice.

OK, now to get this MacBook pro working again. Stick the USB disk in with ArchLinux on into the MacBook pro.

Power on the machine, ideally it needs to have the power cable attached to the machine. As soon as you hit power, press down the alt key at the same time.

You will get an option to either boot from the Macs hard drive, or UEFI. Select UEFI, you will see something like this:

Ensure you have the top item selected for ArchLinux and press e. As you can see at the bottom of this image you will see a line, at the end of that line add nomodeset and hit enter.

You will be booted into ArchLinux:

Change the directory by running the command:

cd /sys/firmware/efi/efivars

You will see something like this:

Run the command:

ls

That is an L not an I. Hit enter and you will something like:

What we are interest in is those GPU lines in the bottom left hand corner, they may not necessarily be there, you just need to look for something like this. But don’t worry if you can’t see them.

Now we have to unmount the efivars folder

Run:

cd /

umount /sys/firmware/efi/efivars/

mount -t efivarfs rw /sys/firmware/efi/efivars/

cd /sys/firmware/efi/efivars/

Then run:

run

chattr -i “gpu-power-prefs- then press tab and close it with a “
chmod ugo+w gpu-power-prefs- then press tab
rm gpu-power-prefs- and press tab to get the file

This will look something like this.

We now need to create a new gpu file that we can mute, run:

printf “\x07\x00\x00\x00\x01\x00\x00\x00” > /sys/firmware/efi/efivars/gpu-power-prefs-fa4ce28d-b62f-4c99-9cc3-6815686e30f9

Now to mute it, the chattr command makes it accessible only to the superuser, so in theory when you boot it won’t mess up, run:

chattr +i “/sys/firmware/efi/efivars/gpu-power-prefs-fa4ce28d-b62f-4c99-9cc3-6815686e30f9”

Now to flush the efivars cache by running:

cd /
umount /sys/firmware/efi/efivars/

In theory, we can now reboot, type in reboot. Initially I had issues booting, it got stuck and kept restarting. So I booted into recover mode by holding down command and R down on boot.

Once in recovery mode I opened the terminal:

If you have more than one partition run the following lines, if you only have one partition you can skip this bit:

diskutil cs list (find UUID for drive)

diskutil coreStorage unlockVolume UUID

Now, we all need to do the following, run the command:

cd /Volumes/Macintosh\ HD

Now, we need to remove the AMD Kexts, first create a directory where we can stick them on the off chance you need them in the future using the line:

mkdir AMD_Kexts

Now, lets move those AMD Kexts:

mv System/Library/Extensions/AMD*.* AMD_Kexts/

then type in reboot:

reboot

In theory, if you have done everything correctly, you should now have a working MacBook Pro.

BUT, please have in mind, this is not a permanent fix. When you upgrade or if you need to reset the SMC or NVRAM you will get the same error and you will need to perform the tasks above again.

I just hope this is a better solution than what was shown in method 1 which kept failing without the SMC or NVRAM being reset.

There is a permanent solution I have found on YouTube, but due to knowing how bad I am at soldering, I think I will pass on that one. But if you want to look at the permanent solution check this out.

But if you do that, you are on your own.

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Gary