[Bug 111921] GPU crash on VegaM (amdgpu: The CS has been rejected)

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=111921

--- Comment #5 from Rémi Verschelde <rverschelde at gmail.com> ---
(In reply to Andrey Grodzovsky from comment #4)
> What happens if you disable GPU reset by loading the kernel with
> amdgpu.gpu_recovery=0 ?

Good point, I forgot to mention that I added `amdgpu.dc=0
amdgpu.gpu_recovery=1` in an attempt to work around this issue just before
reproducing it again. So I can confirm that I could reproduce this issue both
without any amdgpu kernel parameters and with the above two.

I now did some more testing with kernel 5.3.2 and `amdgpu.gpu_recovery=0`
(removing the `amdgpu.dc=0` too). Initially I could not trigger the bug, but I
got it when letting the desktop environment (KDE) trigger its screensaver while
Godot was running on the AMD GPU. Once I resumed from the screensaver, the GPU
crashed (note: I did trigger suspend-to-RAM, the laptop was still powered).

The dmesg output is attached.

To compare, I did another test with kernel 5.1.20 (using `amdgpu.dc=0
amdgpu.gpu_recovery=1`), letting it go to sleep with Godot running on the AMD
GPU, and it resumed without crashing. I also attach the dmesg output for
comparison.

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