What you are seeing is not a *crash* but rather a GPU lockup, or so-
called "X freeze" bug. I'm closing this bug report because it's not
been correctly reported and cannot be analyzed with the information
provided. Please see http://wiki.ubuntu.com/X/Troubleshooting for
assistance in how to debug freezes, and
http://wiki.ubuntu.com/X/Reporting for guidance on filing useful
reports.
** Changed in: xserver-xorg-video-ati (Ubuntu)
Status: Confirmed => Invalid
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[RV770] Crash with screen going into sleep mode within couple hours of booting
https://bugs.launchpad.net/bugs/553014
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