Comment 26 for bug 413168

hehe ... :-) - ok, i got it - that flickering was just because of me stupidly setting radeon.modeset=1 kernel option to have smooth modesetting. (because otherwise i had some crashes when changing to text console (which i ocassionally have to do to poke xorg so my bluetooth mouse gets reconnected)) but ... it obviously has nothing to do with gnome-{screensaver,power-manager} or DeVicEkID-* ... sorry 'bout that