My spontaneous reaction is that this sound like it could be hardware
related.
...on a laptop with Ubuntu 11.04, andlater DistroRelease: Ubuntu 12.04
Which one was it? :P
Have you tried it with another OS or a live CD?
Have you tried it with another screen/type of screen?
What type of screen did you plug in? (CRT/LCD...)
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https://bugs.launchpad.net/bugs/1122695
Title:
Connecting an external monitor cause display corruption on my laptop.
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