[Bug 107152] GPU fault detected: 146 / VM_CONTEXT1_PROTECTION_FAULT / ring gfx timeout

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=107152

--- Comment #13 from Andrey Grodzovsky <andrey.grodzovsky at amd.com> ---
(In reply to dwagner from comment #12)
> Indeed, I found my theory confirmed by many experiments: If I use a script
> like
> > #!/bin/bash
> > cd /sys/class/drm/card0/device
> > echo manual >power_dpm_force_performance_level
> > # low
> > echo 0 >pp_dpm_mclk 
> > echo 0 >pp_dpm_sclk
> > # medium
> > #echo 1 >pp_dpm_mclk 
> > #echo 1 >pp_dpm_sclk
> > # high
> > #echo 1 >pp_dpm_mclk 
> > #echo 6 >pp_dpm_sclk
> to enforce just any performance level, then the crashes do not occur anymore
> - also with the "low frame rate video test".
> 
> So it seems that the transition from one "dpm" performance level to another,
> with a certain probability, causes these crashes. And the more often the
> transitions occur, the sooner one will experience them.
> 
> The dynamic power management issue can now be pursued with the original bug
> report https://bugs.freedesktop.org/show_bug.cgi?id=102322 for the
> vm_update_mode=0 case - there is probably not much sense in keeping this bug
> report open just because errors also occur with wm_update_mode=3, just less
> often.

Agreed.

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