https://bugs.freedesktop.org/show_bug.cgi?id=85107
--- Comment #9 from Marcel Witte wittemar@gmail.com --- Today I tried to use radeon.dpm=0 to get the full performance, but I noticed that with radeon.dpm=0 I get the CPU stuck errors again, even with radeon.bapm=0. So the only way to boot without these errors is "radeon.bapm=0" or "radeon.bapm=0 radeon.dpm=1".