You need a 24 bit screen depth defined in your XF86Config, and possibly
your video BIOS setting changed. Like:
# /etc/X11/XF86Config
Section "Screen"
Identifier "Screen0"
Device "Videocard0"
Monitor "Monitor0"
DefaultDepth 24
SubSection "Display"
Depth 24
Modes "1024x768" "800x600" "640x480"
EndSubSection
EndSection
# sometime during boot process before X server is started
/usr/sbin/845patch 32000 # or some such number
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