[Bug 91880] Radeonsi on Grenada cards (r9 390) exceptionally unstable and poorly performing

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=91880

--- Comment #177 from garththeisen at hotmail.com ---
Created attachment 134324
  --> https://bugs.freedesktop.org/attachment.cgi?id=134324&action=edit
dmesg capture

Logged this problem against 4.13.2. Started up an accelerated program (game)
and with in seconds the screen went black.

In the attached dmesg output the amdgpu emits a timeout *ERROR*, but I was
unable to recover the session/switch DPM parameters to force recovery.

>[   85.983053] [drm:amdgpu_job_timedout [amdgpu]] *ERROR* ring sdma1 timeout, last signaled seq=2103, last emitted seq=2105
>[   85.983125] [drm:amdgpu_job_timedout [amdgpu]] *ERROR* ring gfx timeout, last signaled seq=7839, last emitted seq=7841
>[   85.983129] [drm] No hardware hang detected. Did some blocks stall?
>[   85.983130] [drm] No hardware hang detected. Did some blocks stall?

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