Comment # 5 on bug 58658 from Dmitry Cherkassov

I can confirm that 6532eb17baff6e61b427f29e076883f8941ae664 causes problems.
glxgears start with black screen for few secs and then run at 0.8 FPS.
kernel radeon says smth like this:

[ 2077.626229] radeon 0000:01:00.0: GPU fault detected: 146 0x00239514
[ 2077.632491] radeon 0000:01:00.0:   VM_CONTEXT1_PROTECTION_FAULT_ADDR  
0x00000000
[ 2077.639970] radeon 0000:01:00.0:   VM_CONTEXT1_PROTECTION_FAULT_STATUS
0x00000000