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

https://bugs.freedesktop.org/show_bug.cgi?id=91880

--- Comment #44 from John Frei johann_frei@yahoo.de --- 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.