Can you install the -intel driver and see if it occurs for that as well?
This sounds an awful lot like a bug we hit with nvidia back on Dapper
when the randomized screensaver would start an OpenGL screensaver and
the system would lock up. However, you're not using Dapper, and not
using the nvidia card.
** Changed in: xorg (Ubuntu)
Status: Unconfirmed => Needs Info
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xorg hang after longer (12h) idle time
https://bugs.launchpad.net/bugs/120347
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