Since I started to run xset -dpms, now also as part of a startup script, the problem seems to have gone. Otherwise it was specifically there, when I connected an external monitor to my laptop, using the display port connector. Using the HDMI connector would not provoke the error, which was having all applications closed when simply locking the display using WINDOWS-L or by mouse/menu. The display port connector was the one to use to get the really good resolution going though.
-- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1573345 Title: Dual monitor loses settings after screen sleep To manage notifications about this bug go to: https://bugs.launchpad.net/kscreen/+bug/1573345/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs