Archlinux

arch.log

.asoundrc
---------
pcm.!default {
type hw
card 2
device 0
}
ctl.!default {
type hw
card 2
device 0
}


aplay -l
---------
**** List of PLAYBACK Hardware Devices ****
card 0: Intel [HDA Intel], device 0: STAC92xx Analog [STAC92xx Analog]
  Subdevices: 1/1
  Subdevice #0: subdevice #0
card 1: HDMI [HDA ATI HDMI], device 3: HDMI 0 [HDMI 0]
  Subdevices: 1/1
  Subdevice #0: subdevice #0
card 2: LX3000 [Microsoft LifeChat LX-3000], device 0: USB Audio [USB Audio]
  Subdevices: 0/1
  Subdevice #0: subdevice #0


lsmod|grep '^snd' | column -t
-----------------------------
snd_usb_audio       91777  4
snd_usbmidi_lib     18665  1   snd_usb_audio
snd_rawmidi         19519  1   snd_usbmidi_lib
snd_seq_device      5268   1   snd_rawmidi
snd_hda_codec_hdmi  22092  1
snd_hda_codec_idt   55175  1
snd_hda_intel       22122  2
snd_hda_codec       77927  3   snd_hda_codec_hdmi,snd_hda_codec_idt,snd_hda_intel
snd_hwdep           6325   2   snd_usb_audio,snd_hda_codec
snd_pcm             73856  6   snd_usb_audio,snd_hda_codec_hdmi,snd_hda_intel,snd_hda_codec
snd_timer           19416  1   snd_pcm
snd                 57786  21  snd_usb_audio,snd_usbmidi_lib,snd_rawmidi,snd_seq_device,snd_hda_codec_hdmi,snd_hda_codec_idt,snd_hda_intel,snd_hda_codec,snd_hwdep,snd_pcm,snd_timer
snd_page_alloc      7121   2   snd_hda_intel,snd_pcm



cat /proc/asound/cards
------------------------
 0 [Intel          ]: HDA-Intel - HDA Intel
                      HDA Intel at 0xfbf00000 irq 47
 1 [HDMI           ]: HDA-Intel - HDA ATI HDMI
                      HDA ATI HDMI at 0xfbe30000 irq 48
 2 [LX3000         ]: USB-Audio - Microsoft LifeChat LX-3000
                      Microsoft LifeChat LX-3000 at usb-0000:00:1d.0-1.1, full speed

speaker-test -c2 -Ddefault:2 -twav -l1
---------------------------------------

speaker-test 1.0.24.2

Playback device is default:2
Stream parameters are 48000Hz, S16_LE, 2 channels
WAV file(s)
ALSA lib conf.c:4630:(snd_config_expand) Unknown parameters 2
ALSA lib pcm.c:2212:(snd_pcm_open_noupdate) Unknown PCM default:2
Playback open error: -22,Invalid argument