My Compaq sp700 workstation has both a built in Texas Instruments TVP4020 Permedia 2 (rev 17) and a Matrox Millennium II (rev 0). Xconfigurator chooses the TI which has no driver hence X cannot be configured. XF86Setup however does a fine job. Xconfigurator needs to be able to deal with a choice among all installed display adapters.
This should work fine in the latest release.