https://bugs.freedesktop.org/show_bug.cgi?id=96964
--- Comment #9 from Timothy Pearson kb9vqf@pearsoncomputing.net --- A bit more information: * Disabling DPM does not fix the problem (dpm=0 on module load) * Using hard reset instead of soft reset just makes a complete mess / host hang * It looks like only the CP block needs to be reset (GPU softreset: 0x00000008 corresponds to RADEON_RESET_CP). * After reset DPM is broken, but DPM also breaks after unloading / reloading the radeon module so this may be a red herring.