https://bugs.freedesktop.org/show_bug.cgi?id=69120
--- Comment #24 from Chris Humbert freedesktop@mahadri.com --- Created attachment 93075 --> https://bugs.freedesktop.org/attachment.cgi?id=93075&action=edit cedar-3.13.1-dmesg
radeon.dpm=1 vdpau causes Cedar [HD 5450] to GPU lockup CP stall immediately. The player hangs with a black window. radeon.dpm=0 vdpau works very well.
01:00.0 VGA compatible controller: [AMD/ATI] Cedar [Radeon HD 5450] Linux 3.13.1, xf86-video-ati 7.3.0, mesa 9.5
[ 107.875202] switching to power state: [ 107.875203] ui class: none [ 107.875204] internal class: uvd [ 107.875206] caps: video [ 107.875208] uvd vclk: 54000 dclk: 40000 [ 107.875210] power level 0 sclk: 65000 mclk: 40000 vddc: 1070 vddci: 0 [ 107.875212] power level 1 sclk: 65000 mclk: 40000 vddc: 1070 vddci: 0 [ 107.875213] power level 2 sclk: 65000 mclk: 40000 vddc: 1070 vddci: 0 [ 107.875214] status: r [ 108.178542] [drm:cypress_dpm_set_power_state] *ERROR* rv770_restrict_performance_levels_before_switch failed [ 118.396040] radeon 0000:01:00.0: GPU lockup CP stall for more than 10068msec [ 118.396046] radeon 0000:01:00.0: GPU lockup (waiting for 0x0000000000000004 last fence id 0x0000000000000002 on ring 5) [ 118.545687] [drm:rv770_stop_dpm] *ERROR* Could not force DPM to low. [ 118.545698] [drm] Disabling audio 0 support [ 118.698386] radeon 0000:01:00.0: GPU reset succeeded, trying to resume