Today, after upgrading to 8.10 (woo!) and several hours of research I finally found out how to get rid of this problem =)
This is what I did
1) Start up in Recovery Mode
2)aptitude purge kdm-kde4
3)aptitude reinstall install kdm
4)depmod -a
5)dpkg-reconfigure kdm
6)type exit
7) choose dpkg from the menu
8) answer yes to all
9) drop to root
10) apt-get autoremove
11) find what your graphic driver is
12) uninstall all drivers for your graphics card
13) reboot
14) KDE LOGIN SCREEN!!!
15) Session Type = KDE
16) LOGIN!
This is what I did
1) Start up in Recovery Mode
2)aptitude purge kdm-kde4
3)aptitude reinstall install kdm
4)depmod -a
5)dpkg-reconfigure kdm
6)type exit
7) choose dpkg from the menu
8) answer yes to all
9) drop to root
10) apt-get autoremove
11) find what your graphic driver is
12) uninstall all drivers for your graphics card
13) reboot
14) KDE LOGIN SCREEN!!!
15) Session Type = KDE
16) LOGIN!
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