I can confirm this happens for me. I did try to activate external monitor via xrandr, lxrandr and monitor setting app.
It looks like when light-locker activates, it starts new Xorg instance, and that new instance is using default monitor config: internal only, no external ones. -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1796374 Title: locking session turns off external monitor To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/light-locker/+bug/1796374/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs