Changing display managers

To use kdm as the default display manager instead of gdm in Fedora/Redhat/Mandrake distributions, edit /etc/sysconfig/desktop and add DISPLAYMANAGER="kdm" (or just edit the DISPLAYMANAGER line if it already exists.) Mandrake has two versions of KDE display manager - the normal version is kdm, and Mandrake's tweaked version can be referred to with DISPLAYMANAGER="KDE".

For Suse Linux, you need to play with /etc/sysconfig/displaymanager and edit the DISPLAYMANAGER line either using a text editor or the /etc/sysconfig/Editor in YaST.