linux-kernel - Re: 2.6.39.2: alsa question: usb sound/card shows up as mixer1/audio1?

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Message-ID: <4E292F01.1040400@ladisch.de>
Date:	Fri, 22 Jul 2011 10:04:17 +0200
From:	Clemens Ladisch <clemens@...isch.de>
To:	Justin Piszcz <jpiszcz@...idpixels.com>
CC:	linux-kernel@...r.kernel.org
Subject: Re: 2.6.39.2: alsa question: usb sound/card shows up as mixer1/audio1?

Justin Piszcz wrote:
> I bought two of these but they are actually different devices, on one host 
> it works ok, on the other, I get this:
> ...
> $ cat /proc/asound/cards
>   1 [Device         ]: USB-Audio - C-Media USB Audio Device
>                        C-Media USB Audio Device at usb-0000:00:1d.7-2.4, full speed
> 
> On the working host:
> $ cat /proc/asound/cards
>   0 [Device         ]: USB-Audio - USB PnP Sound Device
>                        C-Media Electronics Inc. USB PnP Sound Device at usb-0000:00:1d.7-2.4, full spe
> 
> Any clue why one is mapped to [1] and the other [0], where the one that is
> [0] works properly and the [1] does not?

Some distributions configure USB devices to not load at index 0 to
prevent conflicts with the primary PCI sound card.  Have a look into
/etc/modprobe.d/.

Regards,
Clemens
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