Well, it seems to work now
How I did it is another question because after some reboots I got TV via VDR + xine when I pushed the TV button. Great, isn't it
I'll try to write down the steps when I'll do the actual install. This is only on a test system and isn't by any chance as powerfull as it should be. That is it shows hard lagging when watching TV. I'm running it on a Fujitsu/Siemens ~800 MHz something with onboard VGA. It's really slooooooow!