After some further investigation, it appears that the keyboard input is actually captured by the application running in the foreground behind GDM. So if I leave a text editor open, lock the display, come back later and try to enter my password, whatever I type on the keyboard is entered into the text editor and not the password entry box in GDM.
-- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1215734 Title: GDM ignores keyboard input in lock screen To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/gdm/+bug/1215734/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs