Maybe you'll have to tell amixer which card to use
(HDSP vs. internal
laptop card). If your HDSP card is alsa card #2, then the command will
be:
amixer -c 2 cset numid=5 26,26,32768 (playback one to line out left)
amixer -c 2 cset numid=5 27,27,32768 (playback two to line out right)
i'm not clear that the channel IDs are right here. what made you
suggest those values thomas?