[Bug 69120] With dpm=1 vdpau is not usable

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=69120

--- Comment #24 from Chris Humbert <freedesktop at 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

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