Comment # 17 on bug 99710 from Sandeep

Definitely seems to be DPM related, I used the following command to force DPM
performance level, and Left 4 Dead 2 and OpenArena worked fine with no hangs.

"echo high > /sys/class/drm/card0/device/power_dpm_force_performance_level"

Works fine if I set "low" as well.

The system hangs if I set "auto".

Well, atleast I have a trace that reproduces it.