I have 2 video cards: agp ati all-in-wonder128 16mb and a 3dfx voodoo3 3000 pci 16mb. When I run 7's installer, it uses the ncurses install. My guess it that it is stupid and can't figure out what to do. When it goes to probe the video card it comes back with voodoo3 3000 pci - and I say "Duh - that's my non-primary card" At this point in the install I can't do a damn thing about it - back will let me go back and see this painful message again. In the bios I have AGP/PCI boot order so I don't understand how the installer grabs the pci card first? After finishing the install, the x config file does have the dri and r128 driver. Note that the voodoo3 card is not there as a second display. I think one solution is to have a menu pop asking is this the right card - have buttons that says "no - let me pick", and "yes". Another thing - how come the installer didn't just use a svga-vesa driver for the install - if it did that then I could've installed with the nice installer. Or, there could be a fallback vga-16 color 640x480 driver that would be used if the installer can't figure out the video card.
We have as a future feature the ability to handle this (admittedly rare) case differently. For now just remove one card, install, and then things should be fine. You can put the secondary card back in once you have the system upgraded.
*** Bug 25153 has been marked as a duplicate of this bug. ***