Comment 1 for bug 68128

I can confirm this issue, with a Philips MC-MC570 stereo as a USB audio device. I do have onboard sound too, but this is disabled in the BIOS and shouldn't be confusing things.

Exact same problem, commenting out "options snd-usb-audio index=-2" in /etc/modprobe.d/alsa-base fully fixes the problem.

Device would partially work in some gnome apps after manually selecting "USB audio" in Sound config for each option, however most apps and esd would not play sound. Above fix completely resolves the problem.

This was not a problem in any previous Ubuntu release, and is a new issue introduced in Edgy.

root@kitt:/home/adam# cat /proc/asound/cards
 0 [UAC3553B ]: USB-Audio - UAC3553B
                      Philips UAC3553B at usb-0000:00:10.0-1, full speed