This sounds a lot like bug 2143073. That's reported against a newer kernel but still Noble with the same symptoms.
-- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/2146851 Title: OOM during screen lock after mutter DPMS change To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/mutter/+bug/2146851/+subscriptions -- ubuntu-bugs mailing list [email protected] https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
