keep xorg from auto-detecting

[Brain Centipedes]

Does anyone know how to keep Xorg from auto-detecting video resolution in
Fedora 8?
On Fedora 7 I just put the correct video settings in /etc/X11/xorg.conf and
everything was fine.  But in Fedora 8 it tries to detect my resolution and
gets things wrong.  So I edited xorg.conf, but X is ignoring the settings in
the conf file and still trying to detect things itself.  Any ideas?
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