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Suddenly my screen looked like this:

strange lines

The pixelated areas are made with GIMP afterwards for privacy reasons. The green lines are the thing I am wondering about. After a reboot everything was fine again. I really don't have any clue how this could happen. Any ideas?

Unfortunately I can't provide any further information. It did not happen again and logs are lost now. The problem occured on a LTSP client using 12.04.2 with XFCE.

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