8.04, Nvidia proprietary, failed logout

[Milos Prudek]

I upgraded 7.04 -> 7.10 -> 8.04. Everything worked perfectly. But nvidia 
proprietary drivers did not (I had the correct packages - nvidia-glx - for my 
GeForce4). So I removed nvidia-glx package and installed binary proprietary 
driver from NVidia website.

Now everything works perfectly except logout. I use kdm. Logout from KDE 
results in a blank screen that does not react to Ctrl-Alt-Backspace.

Workaround is: switch to a text console (Ctrl-Alt-F2), login as root, 
run /etc/init.d/kdm restart.

How can I fix this? 

-- 
Milos Prudek