It sounds like a GPU lockup. These are notoriously hard to debug. On
-intel there are tools and such for doing so, but those don't exist for
nouveau.
It is likely that this issue is fixed in a newer kernel since GPU
lockups tend to be bugs in the kernel drm code. So, you might try just
upgrading your kernel.
Please test Precise (e.g. with a live cd), and if it still occurs there
we can approach upstream about it.
** Package changed: xorg-server (Ubuntu) => xserver-xorg-video-nouveau (Ubuntu)
** Changed in: xserver-xorg-video-nouveau (Ubuntu)
Status: Confirmed => Incomplete
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https://bugs.launchpad.net/bugs/574576
Title:
[GeForce 310M] freeze w/ screen garbling (suspect xorg crash) [Lucid]
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