After a little research, it appears that gnome-screensaver is responsible for locking, so I am moving this bug.
I can trigger the locking by running gnome-screensaver-command --lock Also, I notice that I can still interact with my desktop even though the screen is black. It's as if gnome-screensaver crashes, leaving the brightness at zero. ** Changed in: gnome-session (Ubuntu) Sourcepackagename: gnome-session => gnome-screensaver -- With multiple monitors, screen can be locked, but unlock dialog won't appear https://launchpad.net/bugs/62983 -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
