This guide https://apple.stackexchange.com/a/295805/156133 is working fine on High Sierra. On Catalina installed with dosdude1 patcher (http://dosdude1.com/catalina/) I couldn't make it through, especially the thermal improvement.
I couldn't reload the
sudo kextload /System/Library/Extensions-off/AMDRadeonX3000.kext
. I've got this error:
/System/Library/Extensions-off/AMDRadeonX3000.kext failed to load - (libkern/kext) link error; check the system/kernel logs for errors or try kextutil(8).
I couldn't either create the
sudo nano /force-iGPU-boot.sh, the permission being write only.
Does anyone have a solution how to run a broken GPU late 2011 on Catalina?