Ubuntu
alsa-driver package

usb audio device not given index 0

Bug #68128 reported by sam tygier
32
This bug affects 1 person
Affects Status Importance Assigned to Milestone
alsa-driver (Ubuntu)
Invalid
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

See original description
sam tygier (samtygier)
description: updated
Revision history for this message
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)
Changed in alsa-driver:
status: Unconfirmed → Confirmed
Revision history for this message
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)
Changed in alsa-driver:
importance: Undecided → Wishlist
Revision history for this message
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

Revision history for this message
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
Revision history for this message
Marcus Tomlinson (marcustomlinson) wrote :

This release of Ubuntu is no longer receiving maintenance updates. If this is still an issue on a maintained version of Ubuntu please let us know.

Changed in alsa-driver (Ubuntu):
status: Confirmed → Incomplete
Revision history for this message
Marcus Tomlinson (marcustomlinson) wrote :

This issue has sat incomplete for more than 60 days now. I'm going to close it as invalid. Please feel free re-open if this is still an issue for you. Thank you.

Changed in alsa-driver (Ubuntu):
status: Incomplete → Invalid
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