[Bug 102322] System crashes after "[drm] IP block:gmc_v8_0 is hung!" / [drm] IP block:sdma_v3_0 is hung!

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=102322

--- Comment #68 from dwagner <jb5sgc1n.nya at 20mm.eu> ---
Tested today's current amd-staging-drm-next git head, to see if there has been
any improvement over the last two months.

The bad news: The 3-fps-video-replay test still crashes the driver reproducably
after few minutes, as long as the default automatic power management is active.

The mediocre news: At least it looks as if the linux kernel now survives the
driver crash to some extent, I found messages in the journal like this:

Nov 14 00:59:36 ryzen kernel: [drm:amdgpu_job_timedout [amdgpu]] *ERROR* ring
sdma0 timeout, signaled seq=22008, emitted seq=22010
Nov 14 00:59:36 ryzen kernel: [drm] GPU recovery disabled.
Nov 14 00:59:37 ryzen kernel: [drm:amdgpu_job_timedout [amdgpu]] *ERROR* ring
sdma1 timeout, signaled seq=107, emitted seq=109
Nov 14 00:59:37 ryzen kernel: [drm] GPU recovery disabled.
Nov 14 00:59:40 ryzen kernel: [drm:amdgpu_job_timedout [amdgpu]] *ERROR* ring
sdma0 timeout, signaled seq=22008, emitted seq=22010
Nov 14 00:59:40 ryzen kernel: [drm] GPU recovery disabled.
Nov 14 00:59:41 ryzen kernel: [drm:amdgpu_job_timedout [amdgpu]] *ERROR* ring
sdma1 timeout, signaled seq=107, emitted seq=109

... and so on repeating for several minutes after the screen went blank.

Will test tomorrow if this means I can now collect the diagnostics outputs that
were asked for earlier.

Some good news: S3 suspends/resumes are working fine right now. There are some
scary messages emitted upon resume, but they do not seem to have bad
consequences:

[  281.465654] [drm:emulated_link_detect [amdgpu]] *ERROR* Failed to read EDID
[  281.490719] [drm:emulated_link_detect [amdgpu]] *ERROR* Failed to read EDID
[  282.006225] [drm] Fence fallback timer expired on ring sdma0
[  282.512879] [drm] Fence fallback timer expired on ring sdma0
[  282.556651] [drm] UVD and UVD ENC initialized successfully.
[  282.657771] [drm] VCE initialized successfully.

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