Just installed Void Linux on my 2015 Macbook Pro which has AMD Graphics (Technically it’s a switchable graphics setup with Intel+AMD graphics, but it’s done with a hardware mux switch, and not anything similar to Optimus)
Anyways I installed Xorg and the MATE desktop environment, and I see the desktop background is corrupt by this white opaque overlay which causes Firefox to be mostly white when viewing pages. I noticed some radeon driver and DMAR errors in dmesg, which are in the second screenshot of this imgur album.
Before I rebooted it to see if it would fix it I noticed some
amdgpu: GPU fault detected errors as well.
The laptop is running a little hot due to dust, but I haven’t seen any screen corruption under OS X.