The same happened to me yesterday after a few switches between two accounts. I had this problem, and I had upgraded to gnome-screensaver 2.30.0-0ubuntu2 in a Dell Inspiron 530 a few days ago. Yesterday I had the black sreen.again.
-- black screen after a few user switches https://bugs.launchpad.net/bugs/546578 You received this bug notification because you are a member of Ubuntu Desktop Bugs, which is subscribed to gnome-screensaver in ubuntu. -- desktop-bugs mailing list desktop-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/desktop-bugs