[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 #12 from dwagner <jb5sgc1n.nya at 20mm.eu> ---
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.

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