That is a symptom of a 845g GPU hang, should be fixed in raring.
** Changed in: xserver-xorg-video-intel (Ubuntu)
Status: New = Fix Released
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** Package changed: xorg (Ubuntu) = xserver-xorg-video-intel (Ubuntu)
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https://bugs.launchpad.net/bugs/931056
Title:
screen corrupts, showing white stripes
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** Attachment added: IMG_3681-c.JPG
https://bugs.launchpad.net/bugs/931056/+attachment/2733634/+files/IMG_3681-c.JPG
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https://bugs.launchpad.net/bugs/931056
Title:
screen corrupts,
** Package changed: ubuntu = xorg (Ubuntu)
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https://bugs.launchpad.net/bugs/931056
Title:
screen corrupts, showing white stripes
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