[Bug 70146] New: UVD performance regression on linux-3.12-rc

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=70146

          Priority: medium
            Bug ID: 70146
          Assignee: dri-devel at lists.freedesktop.org
           Summary: UVD performance regression on linux-3.12-rc
          Severity: normal
    Classification: Unclassified
                OS: All
          Reporter: johannes.hirte at fem.tu-ilmenau.de
          Hardware: Other
            Status: NEW
           Version: DRI CVS
         Component: DRM/Radeon
           Product: DRI

When playing h.264 videos with UVD support, the video is sluggish and mplayer
shows the "Your system is too SLOW to play this!" message after a few seconds.

git bisect points me to:

ce3537d57196dfc7094755532e1ffc1af133ca5f is the first bad commit
commit ce3537d57196dfc7094755532e1ffc1af133ca5f
Author: Alex Deucher <alexander.deucher at amd.com>
Date:   Wed Jul 24 12:12:49 2013 -0400

    drm/radeon/dpm: use multiple UVD power states (v3)

    Use the UVD handle information to determine which
    which power states to select when using UVD.  For
    example, decoding a single SD stream requires much
    lower clocks than multiple HD streams.

    v2: switch to a cleaner dpm/uvd interface
    v3: change the uvd power state while streams
    are active if need be

    Signed-off-by: Alex Deucher <alexander.deucher at amd.com>

:040000 040000 d8c5afc839fccfe228d8880817bee5b2a35d0578
af38b8261405bd4212f856499520a50476b50b43 M      drivers

GPU is a Mobility Radeon HD5470

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