I'm experiencing a similar bug: After the update of the 12. December X failed to start, I got a black screen and the keyboard didn't respond. I removed the xorg.conf file (thus changing from the fglrx to the radeon driver) and this resulted in following behavior: still a black screen but with a movable cursor and a working keyboard (however it freezes completely after some time). Creating a clean user didn't change anything. But logging in via a rescue Gnome session worked. I compared the .xsession-errors files from a normal Gnome session and a rescue Gnome session and found the same lines as the original reporter. I attach both .xsession-errors files and the dpkg log of the last updates before the problem appeared.
I'm experiencing a similar bug: After the update of the 12. December X failed to start, I got a black screen and the keyboard didn't respond. I removed the xorg.conf file (thus changing from the fglrx to the radeon driver) and this resulted in following behavior: still a black screen but with a movable cursor and a working keyboard (however it freezes completely after some time). Creating a clean user didn't change anything. But logging in via a rescue Gnome session worked. I compared the .xsession-errors files from a normal Gnome session and a rescue Gnome session and found the same lines as the original reporter. I attach both .xsession-errors files and the dpkg log of the last updates before the problem appeared.