Comment 1 for bug 175744

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Chris Halse Rogers (raof) wrote :

Thank you for your bug report, and for trying to help make Ubuntu better. However, the bug you see here is almost certainly a duplicate of bug #145112. When this happens you should be able to kill X (and everything else running in X) with the magic sysrq key (Alt+SysRq+k). Furthermore, the system log should have errors like "NVRM: Xid" in it.

Can you confirm this? You can browse the system logs with System->Administration->System Logs - kern.log should contain the Xid errors.