Macbook pro 2011 Late cannot enable dGPU again
I'm struggling with some problem involved with enable dGPU AMD Radeon. To the needs of installation MacOS Catalina I had to disable discrete graphics card. I reboot into recovery mode and used command
nvram fa4ce28d-b62f-4c99-9cc3-6815686e30f9:gpu-power-prefs=%01%00%00%00
after reboot I again run in recovery mode and wrote
csrtuil disable
I was following this tutorial http://dosdude1.com/gpudisable/ (I could not run Single-User-Mode).
It worked perfectly and installation Catalina went well. But after this I wasn't able to enable dGPU again. I tried to use key combination CMD+Option+R+P to reset NVRAM and 'nvram -c' in terminal but it didn't help. Also I tried to solve the problem following these guys explanation but it didn't have any effect. (First link, Second link). I was searching any information but I can not find the answear. Below I put picture from /System/Library/Extensions directory (maybe there is something wrong). I really appriciate any help!
(Last week I upgraded this Macbook with SSD Crucial MX500 and Corsair 8 GB DDR3 1333Mhz but it probobly has no issues with this )
Solution 1:
After the steps below, I'm seeing again both graphics cards in "About This Mac" of my MacBookPro 17" Late 2011, running Catalina Patcher. See
- Shut down the computer. Plug in the power adapter to a power source if it's not already connected.
- Press Control+Option+Shift+Power keys to reset the SMC
- Boot and press Control+S immediately after you hear the startup sound. Then enter this command: nvram fa4ce28d-b62f-4c99-9cc3-6815686e30f9:gpu-power-prefs=%00%00%00%00
- Then type 'exit' to reboot.
- Then shut down again the computer.
- Boot and press and hold the Command+Option+P+R immediately after you hear the startup sound. Hold these keys until the computer restarts and you hear the startup sound for a second time.