maybe this info from sidux.com and the links is helpful for you:
Am Montag 04 Mai 2009 05:32:37 schrieb Magicloud Magiclouds:
> I am using debian sid. Recently I installed a new box, after
> installed xorg, I started it.
> It displayed a black desktop with my wm. Keyboard/Mouse/Screen are
> all freezing. Even ctrl alt backspace does not work.
> I have to remote login and kill the session.
> And there is (EE) in Xorg's log....