No errors in any of the log files.
If you move aside your /etc/X11/xorg.conf are you still able to
reproduce the freeze?
When the system is frozen, can you ssh into the computer? If so, please
collect 'sudo dmesg > dmesg.txt' and your /var/log/kern.log and attach
to this bug report.
Also, which screensaver package are you using? The 3D screensavers were
removed from the version of GNOME included in 12.04; are you using
xscreensaver?
** Summary changed:
- system freeze with 3D screensaver
+ [RV370] system freeze with 3D screensaver
** Changed in: mesa (Ubuntu)
Status: New => Incomplete
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https://bugs.launchpad.net/bugs/946822
Title:
[RV370] system freeze with 3D screensaver
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