I have the same issue with dual monitors. I hardly ever see the gnome screensaver unlock dialog when locked as well. I just enter my password blindly with one screen black/blank and the other showing what was on the screen before locked.
-- You received this bug notification because you are a member of Ubuntu Desktop Bugs, which is subscribed to gnome-screensaver in Ubuntu. https://bugs.launchpad.net/bugs/848562 Title: gnome-shell lock screen does not display password prompt To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/gnome-screensaver/+bug/848562/+subscriptions -- desktop-bugs mailing list desktop-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/desktop-bugs