Here is my /etc/sysconfig/desktop
DESKTOP="KDE" DISPLAYMANAGER="KDE"
My default desktop is KDE, and my display manager is KDE.
If you want to change the DISPLAYMANAGER, you can use XDM, GNOME, or KDE
Aha - that's what I was missing, no DISPLAYMANAGER="KDE" entry.
Many thanks.
Mark Farmer RHCT Linux Server Administrator