Jeff Siddall writes:
> So why does GDM still default to Gnome?  Grrr...  So I am fed up
> with GDM.  Any ideas how I ditch GDM and switch to KDM?

Here's how I did it, 3 steps:

  yum install -y xorg-x11-xinit-session

Create a file /etc/sysconfig/desktop containing the line

  DISPLAYMANAGER=KDE

and a patch for /etc/X11/xinit/Xsession is attached.

    Alec

-- 
 	    Alec Habig, University of Minnesota Duluth Physics Dept.
	    		    [log in to unmask]
		       http://neutrino.d.umn.edu/~habig/



--- /etc/X11/xinit/Xsession.issue	2011-03-14 12:54:05.862817718 -0500
+++ /etc/X11/xinit/Xsession	2011-03-14 12:54:05.879720291 -0500
@@ -30,6 +30,14 @@
 # Xsession and xinitrc scripts which has been factored out to avoid duplication
 . /etc/X11/xinit/xinitrc-common
 
+# RHEL6 GDM doesn't seem to support selectable sessions, and always requests a
+# gnome-session. So we unset this default here, to allow things like user
+# .xsession or .Xclients files to be checked, and /etc/sysconfig/desktop
+# settings (via /etc/X11/xinit/Xclients) honoured.
+if [ -n "$GDMSESSION" -a $# -eq 1 -a "$1" = gnome-session ]; then
+  shift
+fi
+
 # This Xsession.d implementation, is intended to obsolte and replace the
 # various mechanisms present in the 'case' statement which follows, and to
 # eventually be able to easily remove all hard coded window manager specific