Only front speakers working when watching tv

[Andras Lorincz <andras.lorincz@gmail.com>]

Hi,

I'm using sarge and I have a pinnacle pctv connected to the auxiliary
port of my Creative Live! 5.1 soundcard from the internal connector of
the tv tuner. My system is 4.1 and all satellites work when watching
movie or listening to music but when I watch tv, only the front
speakers are working no matter if I use tvtime or mplayer, and also I
cannot adjust the volume from tvtime and mplayer, only from alsamixer
or the volume control. Why is this happening?