Bug#636135: xserver-xorg-video-radeon: Logout of KDE gives black screen with pointer still visible.

[oz <oz@bluemonk.de>]

I have that session logout problem on this platform:

* AMD E-350 cpu with AMD Radeon HD 6310 Graphics
* Debian/wheezy
* KDE 4

The mouse-cursor works after session-logout, but on a black background. 
In the middle of the screen, where the login-window would be, the 
cursor-symbol changes. So the display-manager is still running in the 
background.

But there is _no_ problem to lock the desktop and to login again.