In order to definitely rule out aumix, please uninstall (and purge) it and see whether the problem persists.
well, without aumix, it's the very same -- only i can't fix it, since alsamixer misses the relevant control ...
thus, it _is_ pretty much an alsa issue. -- To UNSUBSCRIBE, email to debian-bugs-dist-requ...@lists.debian.org with a subject of "unsubscribe". Trouble? Contact listmas...@lists.debian.org