I'm not sure about how RH is set up, but you need to find your XF86Config-4 (or maybe just XF86Config). It's probably in /etc/X11. Open it in an editor. There should be a section that lists your display modes, for 8, 16, 24 bits etc. There should be lists of resolutions underneath. You need to change these so that the higher ones come first, e.g. "1152x864" "1024x768" "800x600". That should fix it.
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