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@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.