[Bug 108493] Unigine Heaven at 4K crashes amdgpu and causes a GPU hang

[bugzilla-daemon@freedesktop.org]

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https://bugs.freedesktop.org/show_bug.cgi?id=108493

--- Comment #15 from Timur Kristóf <venemo@msn.com> ---
(In reply to Alex Deucher from comment #14)
> I suspect the display may require additional voltage in your case which is
> why you see the issue at 4k.  The display requirements are not handled as
> finely on Linux as they are in windows.

Thanks Alex for explaining the difference between vddc and mvdd.

After using the GPU in this way for a couple of days I can tell you that
increasing the voltage definitely improves the stability of the system but
ultimately it doesn't fix the problem. The GPU can still hang with the same
"ring gfx timeout", it just takes more time before the problem occours.

Some additonal comments:

* I'd like to emphasize that the problem is not specific to 4K and will happen
on 1080p, just later. Ie. the GPU hangs in a couple of minutes instead of
immediately.
* echo high > /sys/class/drm/card0/device/power_dpm_force_performance_level
does not help at all.
* I also tried amdgpu.vm_update_mode=3 (found as a suggestion from another
similar bug report) but it doesn't help at all.
* I also tried manually setting the sclk to a fixed, lower level (another
suggestion from another bugreport) which seems to improve the stability by a
small margin but it also doesn't prevent the GPU from hanging.

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