I'm having the same issue, it appeared not too long ago. Kubuntu 13.04 with xorg-edgers PPA. I'm using the nvidia-313 driver.
Linux user 3.8.0-2-generic #6-Ubuntu SMP Fri Jan 25 22:03:57 UTC 2013 x86_64 x86_64 x86_64 GNU/Linux -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/993187 Title: ubuntu 12.04 completely freezes frequently. To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/993187/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
