[Bug 91880] Radeonsi on Grenada cards (r9 390) exceptionally unstable and poorly performing

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Comment # 47 on bug 91880 from
(In reply to John Frei from comment #44)
> I found out some interesting fact on my system:
> 
> If I start in textmode (runlevel 3) with no specific kernel parameter like
> 'radeon.dpm=0', set power_dm_force_perofrmance_level to 'high' and
> power_dpm_state to 'performance' and finally start the gdm service, the
> system works without crash. I was even able to play some games.
> 
> If I boot in textmode with radeon.dpm=0 and try to set power_profile to
> 'high', I get a crash immediately. I cannot even start gdm in this case.

Ah, setting the force_performance_level was the key, now I can get >70fps in
Unigine heaven without any crashes! I hope dpm gets fixed and trickles down to
Arch Linux soon, it's a bit of a waste to be running my card at full power all
the time...


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