Version: (using KDE 4.0.83) Installed from: Ubuntu Packages It is impossible to change any of the settings in the kdm-kde4 login manager. Unlike in KDE 3, there is no "Administrator" button to allow root access the configuration, and all the options are greyed out. It seems pretty pointless to have the module at all in this state, so I think it qualifies as a (serious) bug rather than a feature request.
*** This bug has been marked as a duplicate of 151669 ***