Created attachment 127138 [details]
dmesg with gpu hang

XFX Radeon RX 480 XXX OC, latest mesa git and llvm svn.

Running unigine heaven for a while hangs the gpu like this:

Okt 08 10:31:14 c-l kernel: [drm:amdgpu_job_timedout] *ERROR* ring gfx timeout,
last signaled seq=42581, last emitted seq=42583
Okt 08 10:31:14 c-l kernel: [drm] IP block:1 is hang!
Okt 08 10:31:14 c-l kernel: [drm] IP block:5 is hang!

I tried bisecting and landed on 4be051aeb3964146d3922238fff0ed1e4a9656d1
"drm/amd/powerplay: use smu7 hwmgr to manager polaris10/11" but I'm not 100%
confident I caught every bad commit because sometimes unigine heaven needs to
run for several minutes before the hang happens and this commit is not trivial
to revert.