Comment 81 for bug 755841

Eureka! I just discovered an even better workaround to the screen tearing problem. This solution also reduces the small amount of juddering that was present in the Mythbuntu MythTV workaround identified in comment #40.

MYTHBUNTU 11.04 MYTHTV VIDEO TEARING WORKAROUND
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From the XFCE4 desktop use the following steps to turn on the compositor:

  Start Applications -> Settings -> Window Manager Tweaks
    Click on the "Compositor" tab
      Enable checkbox "Enable display compositing"
    Close this window

From the MythTV frontend, select the High Quality playback profile:

  Start Applications -> Multimedia -> MythTV Frontend
    Select Utilities/Setup -> Setup -> TV Settings -> Playback
      Select Next 3 times
      On Playback Profiles (3/8) page:
        Set "Content Video Playback Profile": " High Quality"
        Select Next a few times and then Finish

From my testing, the above solution significantly reduces if not eliminates all video tearing or juddering with full screen video. :-)