[Bug 89919] New: VDPAU Playback Slow with CRTC @ 24 hz

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=89919

            Bug ID: 89919
           Summary: VDPAU Playback Slow with CRTC @ 24 hz
           Product: xorg
           Version: unspecified
          Hardware: x86-64 (AMD64)
                OS: Linux (All)
            Status: NEW
          Severity: normal
          Priority: medium
         Component: Driver/Radeon
          Assignee: xorg-driver-ati at lists.x.org
          Reporter: adamvleggett at gmail.com
        QA Contact: xorg-team at lists.x.org

My GPU is Mullins, integrated with the GX-412HC system-on-chip.

I am running Ubuntu 14.10 with xserver-xorg-video-radeon_7.5.0-1.

Video playback through a competent player like mpv is generally smooth even
when using the default performance profile, with the default 60hz display mode
selected. However, if I use xrandr:

xrandr --output HDMI-0 --mode 1920x1080 --rate 24

Suddenly playback becomes quite jerky, and is not helped much by raising the
card to the highest performance profile. This is true of VLC, mpv, and
mplayer2, so I do not think it is player related. This is also true of any
video file.

I have tested this with a variety of radeon DRI and xserver-xorg-video-radeon
versions. In those versions that support Mullins, I have not seen any
differences.

Using a 24hz mode is very desirable when playing back a feature film that was
shot at 24 fps.

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