TVout will work, well it did for me in 8.2 with a mx and a ti4800 (currrently in rma)
You need to make some manual changes in xf86config i found them here a while ago, if you cant find them then ill come back and post my gfx and monitor sections.
how ever that was tvout alone im about to try to see if I can get twinveiw working as it is supposed to work. And i have 9.0 now installed and I have to say im pleased with the fact it actually seems to work with 54g wireless pci
