Enable MacBook Pro Dedicated GPU

AnonMac50

macrumors 68000
Mar 24, 2010
1,550
309
Reset the PRAM (hold CMD-OPT-P-R) before the chime and wait for it to chime a second time, I believe it should work then.
 
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bobmusic

macrumors newbie
Original poster
Sep 29, 2018
3
2
Germany
Thanks, I tried that but it didn't seem to work. Mojave is installed on an external SSD. In the end I ran the 10.13.6 Combo Updater on the internal SSD and that brought the AMD Radeon back to live.
 

mikegasche

macrumors newbie
Jan 21, 2019
4
3
You need to move back the AMD kernel extensions that have been removed from the /System/Library/Extensions folder too! Basically all files that start with AMD*. If you can't find them in the root directory, where they should have been copied for recovery issues, you must get them back from your time machine. Copy them from the time machine app, not from the backup directories in the external time machine drive! Make sure they have the same user and groups settings as the other kernel extensions, recursively, since these files are packages!
 
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Javier's got a Mac proble

macrumors newbie
Apr 26, 2020
1
0
Mexico
You need to move back the AMD kernel extensions that have been removed from the /System/Library/Extensions folder too! Basically all files that start with AMD*. If you can't find them in the root directory, where they should have been copied for recovery issues, you must get them back from your time machine. Copy them from the time machine app, not from the backup directories in the external time machine drive! Make sure they have the same user and groups settings as the other kernel extensions, recursively, since these files are packages!
Can you please help me?, I'm really desperate. Same problem, everything was fine before I followed dosdudes instructions for Mojave install and deactivated the GPU. I actually succesfully installed Mojave, but because of other reasons, after half a year I downgraded again to High Sierra 10.3.6, and the brightness adjust and sleep mode are not working at all. The nvram CMD-OPT-P-R reset hasn't worked, even with the SMC reset. I'm just trying to get my laptop to be the way it was before I followed these instructions, it had np issues with the GPU. SOMEONE PLEASE PLEASE HELP ME:((( id be really grateful. These are the o instrcutions i followed
 

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whitestonedata

macrumors newbie
May 18, 2020
1
0
Can you please help me?, I'm really desperate. Same problem, everything was fine before I followed dosdudes instructions for Mojave install and deactivated the GPU. I actually succesfully installed Mojave, but because of other reasons, after half a year I downgraded again to High Sierra 10.3.6, and the brightness adjust and sleep mode are not working at all. The nvram CMD-OPT-P-R reset hasn't worked, even with the SMC reset. I'm just trying to get my laptop to be the way it was before I followed these instructions, it had np issues with the GPU. SOMEONE PLEASE PLEASE HELP ME:((( id be really grateful. These are the o instrcutions i followed
This helped me:

Boot with control + s

Then enter this command:
nvram fa4ce28d-b62f-4c99-9cc3-6815686e30f9:gpu-power-prefs=%00%00%00%00

Then type exit to reboot.

Info found on this page:
https://gist.github.com/cdleon/ae1542279598fe80f527400cc354a956
 
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