Hm.

Ok.  So, that log shows you booting with just the laptop's internal
panel, plugging in a second display to the VGA port, which comes up in
an extended desktop situation, then disabling the VGA output, presumably
through the Monitors capplet or equivalent, and then letting the timeout
expire to get back to the extended desktop.

Once it's back on the extended desktop the display returns to normal?

Given that the mouse pointer continues working properly I'd guess the
problem is somewhere in the framebuffer settings for that particular
mode change.

-- 
[Maverick] Removing external display on Vostro 3500 corrupts the screen
https://bugs.launchpad.net/bugs/629711
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