[alsa-devel] Cannot load snd-usb-audio on 3.12-rc2

David Henningsson david.henningsson at canonical.com
Thu Sep 26 10:10:43 CEST 2013

On 09/24/2013 05:52 PM, Daniel Mack wrote:
> Hi Sarah,
> On 24.09.2013 01:41, Sarah Sharp wrote:
>> The snd-usb-audio driver no longer loads properly on 3.12-rc2 when I
>> plug in my USB headset.  It worked fine on 3.11-rc4 (not sure about
>> vanilla 3.11).
>> Trying to manually load the driver fails:
>> sarah at xanatos:~$ sudo modprobe snd-usb-audio
>> FATAL: Error inserting snd_usb_audio
>> (/lib/modules/3.12.0-rc2/kernel/sound/usb/snd-usb-audio.ko): Invalid argument
>> dmesg shows:
>> [   44.231668] snd_usb_audio: `-2' invalid for parameter `index'
> That's really strange. I just tested on an ARM board where I currently
> run 3.12-rc2 as well, and I can load the module without problems. Also,
> sound/usb/card.c (where the params are declared) hasn't seen an update
> in 3.12.
> I suspect your OS is passing "index=-2" from something like
> /etc/modprobe.d/* or cmdline settings. Could you investigate in that
> direction?

Ubuntu has passed

options snd-usb-audio index=-2

...since ages. It is, AFAIK, a very valid way of trying to make "some
other card" be card 0.
This is because card 0 is the default in some apps which are not using
PulseAudio, so it's mostly there for historical reasons.

David Henningsson, Canonical Ltd.

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