On a SIS530 chipset board with an ATI rage card plugged into it and onboard video Xconfigurator tries to write an Xconfig file for the onboard video even when its not the primary card. Xconfigurator should check the card is occupying the ISA legacy video windows before configuring it in preference to another card. If it owns some of the 0xD0000->0xDFFFF range addresses then its the primary card.
Xconfigurator FTTB can't handle multiple video cards (e.g. selecting one of them). This will be added in the rewrite.
Note this change of title is misleading. The on board video is NOT available its PCI resources are disabled. Thus this is seperate to things like having four 3DFX cards in a single PC. Its a bug that wants fixing not a quirk. Title adjusted
as of kudzu 0.92, soon available in rawhide, disabled video cards will be skipped.