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 )
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 )