I started having this issue after upgrading to Oneiric (11.10). Previous versions of Ubuntu worked fine. I'm using nvidia card with dual-head (twinview). also, I'm using gnome3 from universe.
locking screen works. no screensaver. moving the mouse shows the mouse pointer changing when it goes over the dialog where you would be typing your password. typing my password logs me in. on 11.04 I was using gnome3 from the gnome3 ppa team and everything worked fine. then i did a do-release-upgrade -d a few days after beta1 was announced. -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to the bug report. https://bugs.launchpad.net/bugs/45018 Title: Unlock screen is invisible with Nvidia twinview To manage notifications about this bug go to: https://bugs.launchpad.net/gnome-screensaver/+bug/45018/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs