For what it's worth, there's a suggestion in this thread that worked for me:
Setting in grub.conf: i915.i915_enable_rc6=0 i915.i915_enable_fbc=0 (instead of =1 on both) just made my computer come back from "windows mode" -- 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
