how to tell kdm to display greeter on laptop not HDMI output?

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http://forums.fedoraforum.org – If I boot with hdmi cable attached the login screen does not appear on the laptop (LVDS) rather HDMI-0 if it's turned on or not. This is very annoying as the hdmi output is not always being an extra monitor. Plus looking for some insight into the kdmrc I find /usr/share/doc/HTML/en/kdm/kdmrc-ref.docbook --big help! Why are all the HTML docs in docbook format? I tried a ~/.xprofile but of course that's not read until I log in so it's no help. Does anybody know how to get kdm login to always display on the laptop screen? (HowTos)