Hi Aditya, this looks similar to a bug believed to be fixed in the 2.6.38-7.36 kernel. Please upgrade to latest kernel and re-test. If you still see a freeze, it would be best if you could file a new bug if/when apport pops up the bug reporting dialog, so it'll collect up to date logs and gpu dump info.
** Changed in: xserver-xorg-video-intel (Ubuntu) Status: Confirmed => Fix Released -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/734313 Title: [i946gz] GPU lockup (ESR: 0x00000001 IPEHR: 0xff2b001e) -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs