http://live.gnome.org/GnomeScreensaver/FrequentlyAskedQuestions#head- f718251faff163b00686836433c40cb7ef726c7d or http://www.gnome.org/learn/admin-guide/latest/screensavers-3.html -- Doesn't show up in gnome-screensaver list https://launchpad.net/bugs/56436