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Old 12-04-2010, 03:54 AM   #1
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Registered: Dec 2010
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ALSA Config for USB Microphone

Hi All,

I am using USB Microphone for Audio capture over a board.I want to test audio record using ALSA arecord utility.But, USB microphone is not getting listed in "arecord -L" command.

USB microphone is getting detected as second sound card as below.

# cat /proc/asound/cards
0 [omap3evm ]: twl4030 - omap3evm
omap3evm (twl4030)
1 [Q9000 ]: USB-Audio - QuickCam Pro 9000
Logitech, Inc. QuickCam Pro 9000 at usb-musb_hdrc-1.4, high speed

But, If I do "arecord -L",it is listing only default first card as below

# alsa_arecord -L
Default Audio Device
Discard all samples (playback) or generate zero samples (capture)

Could anybody help me to list my second sound card in arecord PCM device list..??

Do I need to do something in alsa.conf file...??

Old 12-04-2010, 09:12 PM   #2
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Registered: Apr 2004
Location: Brisbane, Australia
Distribution: pclinuxos slackware64 tails kali
Posts: 3,382
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Hi Ganesh, Welcome to LQ!

LQ has a fantastic search function that may save you time waiting for an answer to a popular question.

With over 4 million posts to search it's possible the answer has been given.
I have a usb soundcard, and had similar problems when I tested it.

I fixed it by turning off the onboard sound chip in bios.

But there are other ways to change the preference, but with the driver modules instead.

The text file, /etc/modprobe.conf...may list the modules loaded at boot time, eg,
options snd_usb_audio enable=1 index=0 vid=0582 pid=00e7 id=EDIROL
alias sound-slot-0 snd_usb_audio
to find out your hardware address (vid and pid) type
to find the module type
, (should be quite a list),

shorten it by grepping for specifics, like sound, snd, audio, etc.

on my system...
glenn@GamesBox:~$ lsmod | grep snd
snd_usb_audio         107687  3 
snd_hwdep               6900  1 snd_usb_audio
snd_usbmidi_lib        20926  1 snd_usb_audio
snd_rawmidi            25013  1 snd_usbmidi_lib
snd_seq_dummy           1806  0 
snd_seq_oss            34806  0 
snd_seq_midi_event      7355  1 snd_seq_oss
snd_seq                61015  5 snd_seq_dummy,snd_seq_oss,snd_seq_midi_event
snd_seq_device          7098  4 snd_rawmidi,snd_seq_dummy,snd_seq_oss,snd_seq
snd_pcm_oss            47375  0 
snd_pcm                96125  3 snd_usb_audio,snd_pcm_oss
snd_timer              23555  2 snd_seq,snd_pcm
snd_page_alloc          8716  1 snd_pcm
snd_mixer_oss          17620  1 snd_pcm_oss
snd                    75507  17 snd_usb_audio,snd_hwdep,snd_usbmidi_lib,snd_rawmidi,snd_seq_dummy,snd_seq_oss,snd_seq,snd_seq_device,snd_pcm_oss,snd_pcm,snd_timer,snd_mixer_oss
soundcore               7869  1 snd
usbcore               212405  12 snd_usb_audio,option,usb_wwan,gspca_spca561,gspca_main,usbhid,usbserial,usb_storage,snd_usbmidi_lib,ohci_hcd,ehci_hcd
The version of your kernel (type uname -a) and distribution may also affect the outcome of these ls commands.

You need to be root to save any changes to /etc/modprobe.conf

see how you go, regards Glenn


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