[LAU] [problem] no sound from one channel, VIA Technologies Inc. VT1720/24

Hi I have this PCI soundcard (from "Encore" manufacturer)  and I am using debian lenny lspci | grep audio 01:09.0 Multimedia audio controller: VIA Technologies Inc. VT1720/24 [Envy24PT/HT] PCI Multi-Channel Audio Controller (rev 01) I cant get sound of the 2 channels using neither an old 2.6.18 kernel or a new 2.6.32 from Debian or a 2.6.29 from Musix. There is no problem with the physical output jacks: all headphones play only one channel. Also i tried with all the mixers: alsamixer, gamix, gnome-alsamixer, kmix, etc. enabling and disabling all the things and it does not work well. Any clue? uname -a Linux musix 2.6.32-trunk-686 #1 SMP Sun Jan 10 06:32:16 UTC 2010 i686 GNU/Linux Regards, -- Marcos Guglielmetti www.musix.org.ar www.ovejafm.com