As my comments before, I couldn't get the log as the bug happens during shut down. If someone please tell me how to display/collect kernel output during shutdown, I will provide a log for further investigation. And I have no way to know what package is involved until a log is collected.
Re brad-figg's request: not able to do apport-collect 1019386 as the bug happens after shutdown sequence started. Changing status to "Confirmed". ** Changed in: linux (Ubuntu) Status: Incomplete => Confirmed -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1019386 Title: Shut down hangs when HDMI cable is plugged in To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1019386/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs