Solved for me. No longer getting the error in Xorg.0.log and my video
performance is better than before. MythTV, vlc and gmplayer work at full
screen using a fraction of the CPU. Still some choppy video with Miro,
and Totem is not displaying video but I am not getting the error.

I had luck by Reverting the Jaunty Xorg intel driver to 2.4 as explained
in this link

https://wiki.ubuntu.com/ReinhardTartler/X/RevertingIntelDriverTo2.4

Then I edited

xorg.conf adding the following to the "Device" section
        Option          "MigrationHeuristic" "greedy"
        Option          "AccelMethod" "xaa"

I don't know if changing gstreamer-properties  Default output to  "X
Windows System (No Xv)" had any effect but it is working so I also left
it.

Just in case you are wondering. Here is the result of "lspci -nn | grep VGA" 
00:02.0 VGA compatible controller [0300]: Intel Corporation 82865G Integrated 
Graphics Controller [8086:2572] (rev 02)

If I have some time I will try moving up to 2.8 as explained here:
https://wiki.ubuntu.com/X/Troubleshooting/IntelPerformance

-- 
[i865] [Jaunty] - Can not start tvtime (since DRI is disabled)
https://bugs.launchpad.net/bugs/367546
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which is subscribed to xserver-xorg-video-intel in ubuntu.

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