Ubuntu

usb audio device not given index 0

Reported by sam tygier on 2006-10-25
32
This bug affects 1 person
Affects Status Importance Assigned to Milestone
alsa-driver (Ubuntu)
Wishlist
Ubuntu Audio Team

Bug Description

I have an iMic usb audio device. the built in sound card on the machine is disabled in BIOS.

under dapper the iMic was the default device. after upgrading to edgy the iMic was given device index 1, an so is no longer used by sound playing apps.

commenting out the line
options snd-usb-audio index=-2
in
/etc/modprobe.d/alsa-base
restores the dapper behaviour.

I understand that this change was made to fix bug 31109, bug 46996, bug 46998 in alsa-driver (1.0.11-5ubuntu1).

in the case of a real usb sound card, surely it should be the default sound card. why would i plug one in if i wanted to use the built in sound.

in edgy:
sam@flute:~$ cat /proc/asound/cards
 1 [system ]: USB-Audio - iMic USB audio system
                      Griffin Technology, Inc iMic USB audio system at usb-0000:00:10.0-2, full speed

in edgy with the line commented out:
sam@flute:~$ cat /proc/asound/cards
 0 [system ]: USB-Audio - iMic USB audio system
                      Griffin Technology, Inc iMic USB audio system at usb-0000:00:10.0-2, full speed

sam tygier (samtygier) on 2006-10-25
description: updated
Adam Rhodes (ubuntu-adamrhodes) wrote :

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

sam tygier (samtygier) on 2006-11-03
Changed in alsa-driver:
status: Unconfirmed → Confirmed
Anders Østerholt (diebels) wrote :

Confirmed for my creative labs xmod, with the onboard snd-hda-intel blacklisted.

$ cat /proc/asound/cards
 0 [Xmod ]: USB-Audio - Creative Xmod
                      Creative Technology Ltd Creative Xmod at usb-0000:00:1d.1-1, full speed

$ lsusb
Bus 003 Device 002: ID 041e:30d0 Creative Technology, Ltd

Daniel T Chen (crimsun) on 2007-04-06
Changed in alsa-driver:
importance: Undecided → Wishlist
sam tygier (samtygier) wrote :

this bug is still present in feisty

i upgraded the machine to feisty, and accepted the maintainer modified /etc/modprobe.d/alsa-base , i needed to make the change again before i could use the usb audio device

Daniel T Chen (crimsun) wrote :

(Note: with the inclusion of PulseAudio, this symptom is much lessened in severity.)

Changed in alsa-driver:
assignee: nobody → ubuntu-audio
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