[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 #90 from jeroenimo <freedesktop at jeroenimo.nl> ---
I managed to run glmark2 without crashing the system with 

By running the card manual at lowest frequency

from root shell:
echo manual > /sys/class/drm/card0/device/power_dpm_force_performance_level
echo 0 > /sys/class/drm/card0/device/pp_dpm_sclk

root at jeroenimo-amd:/home/jeroen# cat /sys/class/drm/card0/device/pp_dpm_sclk 
0: 214Mhz *
1: 387Mhz 
2: 843Mhz 
3: 995Mhz 
4: 1062Mhz 
5: 1108Mhz 
6: 1149Mhz 
7: 1176Mhz 
root at jeroenimo-amd:/home/jeroen# 

If I go to higher e.g. 2: 843Mhz I manage to crash it.. although it takes a
while before it crashes. 

when I force the card to anything above 4 I get an immediate crash without even
starting glmark2

I hope this helps!

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