If I have an external monitor, then I get a crash when when I move my mouse cursor on to the primary (laptop) display. I get the same traceback in my syslog as that posted above by @shinyblue.
My graphics card is the integrated Intel HD Graphics 520 Mobile, i5 6200U, using driver i915_bpo. My whole system crashes, not just X - I cannot ctrl-alt-f1 to get to virtual terminals. I have to hold down the power button to recover. During login, both displays work fine. If I keep my mouse cursor on the external monitor, everything is fine. With no external monitor, everything is fine. This just started when I upgraded to Ubuntu 16.04. On 15.10, everything was fine. Lenovo Thinkpad T460, Ubu Intel HD Graphics 520 Mobile, i5 6200U, driver i915_bpo, Ubuntu 16.04. There are a few people with the same problem here: http://askubuntu.com/questions/762373/laptop-freezes-after-connecting- external-monitor-since-16-04-update -- 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
