Hi, probably your kernel load the new snd-pcsp module (present in kernel >= 2.6.25) as the first sound card: try to blacklist snd-pcsp or install package alsa-base >=1.0.16-2. Please take a look at debian bug #481979 (http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=481979) and see my comment on this bug (http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=481979#27), looks very similar to your problem. Hope will help, Andrea.