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    <body><table border="1" cellspacing="0" cellpadding="8">
        <tr>
          <th>Bug ID</th>
          <td><a class="bz_bug_link 
          bz_status_NEW "
   title="NEW - VDPAU Playback Slow with CRTC @ 24 hz"
   href="https://bugs.freedesktop.org/show_bug.cgi?id=89919">89919</a>
          </td>
        </tr>

        <tr>
          <th>Summary</th>
          <td>VDPAU Playback Slow with CRTC @ 24 hz
          </td>
        </tr>

        <tr>
          <th>Product</th>
          <td>xorg
          </td>
        </tr>

        <tr>
          <th>Version</th>
          <td>unspecified
          </td>
        </tr>

        <tr>
          <th>Hardware</th>
          <td>x86-64 (AMD64)
          </td>
        </tr>

        <tr>
          <th>OS</th>
          <td>Linux (All)
          </td>
        </tr>

        <tr>
          <th>Status</th>
          <td>NEW
          </td>
        </tr>

        <tr>
          <th>Severity</th>
          <td>normal
          </td>
        </tr>

        <tr>
          <th>Priority</th>
          <td>medium
          </td>
        </tr>

        <tr>
          <th>Component</th>
          <td>Driver/Radeon
          </td>
        </tr>

        <tr>
          <th>Assignee</th>
          <td>xorg-driver-ati@lists.x.org
          </td>
        </tr>

        <tr>
          <th>Reporter</th>
          <td>adamvleggett@gmail.com
          </td>
        </tr>

        <tr>
          <th>QA Contact</th>
          <td>xorg-team@lists.x.org
          </td>
        </tr></table>
      <p>
        <div>
        <pre>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.</pre>
        </div>
      </p>
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