I'm seeing this problem also on Xubuntu 16.04.1 I can also add another symptom to the reporters observations:
5) When locking the screen again with Ctrl+Alt+Del both screens are blanked (background light still on) and the computer does not react to keyboard inputs (I can SSH in). ** Tags added: xenial xubuntu-exp ** Tags removed: xubuntu-exp -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1520970 Title: light-locker switches disabled screen on (when used with xfce) To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/light-locker/+bug/1520970/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs