I think I have found at least a quirk, though: if I try to connect a
composite video source to the card, using the composite-to-svideo
adapter bundled with the card, my computer freezes (hard and fast: no
response from keyboard, not even keyboard leds blinking the familiar
kernel panic signal). After that rebooting the sistem (even cold
rebooting it, or switching everything off, removing the card, going for
a 15 minutes walk and then putting everything back in order) and running
tvtime (or mplayer, or even the media center analog channel search
routine under Windows!) makes the computer freeze again.
Every single time.
In order to recover from this unfortunate condition I had to boot
Windows and run the DVB-T channel search utility from the media center
control panel. I don't know what is going on, and I am willing to help
debugging (as long as I don't have to modify the hardware in any way)
because I was counting on getting the composite input to work.