problems with 2.4.4 and bttv-0.7.65

Hello,
 
I'm using a board FlyVideo '98/FM.
With kernel 2.4.4 and xawtv-3.30, I'm running the radio app, and all works ok.
 
After apply the patch for bttv-0.7.65 (http://bytesex.org/bttv/bttv-0.7.65-2.4.4.diff.gz), I found a problem:
* start radio, tunning an station, but have no audio output;
* close radio, start xawtv, then the audio from station tunned before appear ok;
 
It's a bug on bttv-0.7.65? Or is a problem relative a mixer, audio volume of FlyVideo board?
 
I try upgrade to package xawtv-3.47, but the problem persist.
 
Thanks for some help.