This is the way on macOS, can I do this thing on Solus? Thanks```
Mac-Mini 2011 - AMD Radeon GPU Failure
How to disable Radeon card. (Not perfect solution but it works)
Boot your mac in single user mode (Press cmd+s while booting)
Mount your root partition in read/write mode ( mount -uw / )
Move all ATI kernel extensions to another directory ( mkdir /ATI;mv /System/Library/Extensions/ATI* /ATI )
and reboot your mac.
After any MacOS update, ATI kernel extensions will be replaced. So you have to repeat this steps.