I have a 350, the v4L linux kernel module picks it up no problem, from there you just need a front end, I use mplayer via some scripts I wrote to play TV back and I use a hacked version of a program called vcr to do recording. I used mythtv for awhile but never really needed all that stuff. Ive tried a few programs, kdetv wasnt bad, xawtv works too.
best way to troubleshoot yours is run the front end from a terminal and look for the output, after of course making sure at least the kernel knows its there