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As I understand it, kdm will use the same resolution as the X server default, the same as all the users have when they log in. To change this, log in, select "System Settings" from the KDE menu, choose "Monitor & Display", and change to Administrator Mode (the button at the bottom). You should then be able to change the resolution.
If you want kdm to have a different resolution to the user desktops, I don't know if it's possible.
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