[LAU] Several USB cards position in /proc/asound/cards

[Pedro Lopez-Cabanillas]

On Thursday, October 8, 2009, Ismael Valladolid Torres wrote:
> I used to have three soundcards in this system. One internal soundcard
> embedded in my mobo, then an RME PCI soundcard, and an USB MIDI
> interface. Then I added this code to /etc/modprobe.d/alsa-base.conf .
>
> # Make sure internal soundcard grabs index 0
> alias snd-card-0 snd-intel8x0
> alias sound-slot-0 snd-intel8x0
> options snd-intel8x0 index=0
> alias snd-card-1 snd-rme96
> alias sound-slot-1 snd-rme96
> options snd-rme96 index=1
> alias snd-card-2 snd-usb-audio
> alias sound-slot-2 snd-usb-audio
> options snd-usb-audio index=2
>
> So in /proc/asound/cards the internal soundcard gets index 0, the PCI
> soundcard gets index 1 and the MIDI interface gets index 2.
>
> Now I bought an USB webcam, which also has a mic input. It appears in
> the system as another USB soundcard. The problem is that during boot
> as hotplug runs before anything else the first soundcard gets index 2
> as specified by alsa-base.conf but the second soundcard overrides
> index 0. Module snd-intel8x0 is loaded but internal soundcard is not
> available and does not appear in /proc/asound/cards.
>
> How do I specify order of *several* USB soundcards in alsa-base.conf?

http://alsa.opensrc.org/index.php/MultipleUSBAudioDevices

Regards,
Pedro