Problems when Configuring the Login Screen by the KDE4 Login Manager
System
KDE 4.3 / KDE 3.5 / KDM
openSUSE 11.2 (x86_64)
Symptom
Settings taken by the KDE4 login manager have no effect on the login screen.
After updating a KDE3-based Linux system (in my case openSUSE) to a new version based on KDE4, it may happen that the login screen cannot be changed by the login manager of KDE4 (System Settings|System|Login Manager) anymore. Even though the settings taken there are stored correctly at the dedicated location
/usr/share/kde4/config/kdm