well, I added Option "IgnoreDisplayDevices" "TV" but it didn't changed anything.
Second, the same configuration worked fine, with a 4mx 440, both cards have a TV out.
X hangs when intializing the AGP interface for the first time. (dmesg tells me so).
Killing X and starting it again solves the problem, for me. I tried three driver versions, different versions of minion patches and 2.6.1-rc3, 2.6.1, 2.6.1-mm2 and 2.6.1-mm3 with no difference.