Actually it didn't at all, the problem is certainly multiple screens. You can see the windows that were open and even worse you can freely click aything you see!!! Keyboard input is redirected to lock screen. At least. I believe it comes mainly if put in standby with second screen connected and resuming with second screen disconnected or another one connected.
Output of the above mentioned before standby+after resuming: dbus-monitor --session "interface='org.gnome.ScreenSaver'" signal time=1474962360.370328 sender=org.freedesktop.DBus -> destination=:1.179 serial=2 path=/org/freedesktop/DBus; interface=org.freedesktop.DBus; member=NameAcquired string ":1.179" signal time=1474962360.370400 sender=org.freedesktop.DBus -> destination=:1.179 serial=4 path=/org/freedesktop/DBus; interface=org.freedesktop.DBus; member=NameLost string ":1.179" Even text is garbled. Jan -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1577110 Title: Lockscreen problems in Ubuntu 16.04 To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/unity/+bug/1577110/+subscriptions -- ubuntu-bugs mailing list [email protected] https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
