I've seen posts where this has been asked but never seen an actual solution.
KDM ignores the screen resolutions set in KDE and Xorg.conf. My display is a 1440x900 widescreen LCD. I've set up Xorg and my KDE desktop to use that resolution and it looks great, but when the KDM login screen comes up it's back to something like 800x600, the login box isn't centered and it's too big. Using Crtl-Alt-+ or - changes between what looks like 640x480 and 800x600, (bad and worse).
I've been able to use kdmrc, Xsetup and Xstartup to set backgrounds, screensavers, etc but no matter what I haven't found a way to set the login's display size to a larger area. Every time I log in the screen resoultion is switched to 1440x900, but logout and it switches back down and looks bad again.
Is there a way to tell KDM what screen resolution to use?