Comment 3 for bug 156930

What sound card did you have this problem with? Do you mean your "DAC" channel was set to 0 (rather than "DCA")?

Thanks for the tip on alsamixer -c 0 - I also needed to specify -c 0, even though the man page labels that as the default. Seems like a bug.

lspci says I'm using
 00:1b.0 Audio device: Intel Corporation 82801H (ICH8 Family) HD Audio Controller (rev 03)
which alsamixer calls Card: HDA Intel Chip: Generic 1095 ID 1392
And I'm running gutsy.

But sound is working fine for me.

Merging your troubleshooting ideas with relevant ubuntu documentation, e.g. at help.ubuntu.com, would probably reach a lot more people.