Same problem on 16.04.5 with HP Elite Display E240. Thanks to @Jaghou for workarond: set 'Auto-Switch Input' to off on display settings resolved the issue.
-- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1292041 Title: Lockscreen doesn't turn off the screen To manage notifications about this bug go to: https://bugs.launchpad.net/oem-priority/+bug/1292041/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs