Several possibilities:
1. I see you're using an AGP card. Sometimes the AGPMode settings are
incompatible with your host bridge, causing various kinds of problems.
For explanation and directions on testing this, please see
https://wiki.ubuntu.com/X/Quirks/#ATI AGP Mode Quirk
2. Anecdotally we've seen some reports that Xv works better with EXA
than with the default XAA acceleration architecture. Test this by
setting in xorg.conf:
Section "Device"
...
Option "AccelMethod" "EXA"
EndSection
3. Xinerama is no longer supported upstream nor by Ubuntu. So if the
above two things don't solve it, please reproduce the issue without
using Xinerama, either in a single-head configuration or with dual-head
via xrandr.
4. There is a backtrace shown in your Xorg.0.log, but it's got
incomplete info. Please collect a full backtrace using the directions
at http://wiki.ubuntu.com/X/Backtracing. If the issue is not covered by
any of the other options above, and still occurs without Xinerama
enabled, we can use the backtrace to figure out where to look next.
--
[r200] multihead lockups with textured video Xv adaptor
https://bugs.launchpad.net/bugs/278454
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