Same problem on my laptop, started right after upgrade from 15.10 to 16.04. Happens right after I plug external monitor to to HDMI socket, system freezes and not responding to any actions from keyboard and touchpad. I'm using Intel® HD Graphics 520.
-- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1559308 Title: Plugging HDMI screen in causes system hang To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/xorg/+bug/1559308/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
