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Re: Help with USB audio card

On 08/07/17 05:15, Rodolfo Medina wrote:

Hi all.

I just bought an external USB audio card.  I plugged it into the USB port of my
PC and plugged a 3.5mm jack microphone into the `mic' input of the card.  It is
shown in lsusb:

$ lsusb
Bus 002 Device 005: ID 17ef:602e Lenovo
Bus 002 Device 003: ID 046d:c312 Logitech, Inc. DeLuxe 250 Keyboard
Bus 002 Device 002: ID 0438:7900 Advanced Micro Devices, Inc.
Bus 002 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 001 Device 010: ID 0d8c:013c C-Media Electronics, Inc. CM108 Audio Controlle
Bus 001 Device 003: ID 0bda:0129 Realtek Semiconductor Corp. RTS5129 Card Reader
Bus 001 Device 002: ID 0438:7900 Advanced Micro Devices, Inc.
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 004 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
Bus 003 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub


and also in arecord:

$ arecord --list-devices
**** List of CAPTURE Hardware Devices ****
card 1: Generic [HD-Audio Generic], device 0: ALC662 rev3 Analog [ALC662 rev3 Analog]
  Subdevices: 0/1
  Subdevice #0: subdevice #0
card 1: Generic [HD-Audio Generic], device 2: ALC662 rev3 Alt Analog [ALC662 rev3 Alt Analog]
  Subdevices: 1/1
  Subdevice #0: subdevice #0
card 2: Device [USB PnP Sound Device], device 0: USB Audio [USB Audio]
  Subdevices: 1/1
  Subdevice #0: subdevice #0

Besides, I ran alsamixer, selected the USB card and unmuted everything.  But
then, when I try to record, no sound is recorded.  I do:

 $ sox -t alsa hw:2,0 output.wav

, or

 $ arecord -f S16_LE -D hw:2,0 -r 96000 test.wav

, or also within Audacity.  But nothing, my voice is not recorded.  Please help
whoever can.


STFW I found some information that might be useful.


Here is the chip makers web site:

https://www.cmedia.com.tw/EN/index.html


It looks like two versions of the chip are currently made:

https://www.cmedia.com.tw/products/USB20_FULL_SPEED/CM108AH

https://www.cmedia.com.tw/products/USB20_FULL_SPEED/CM108B
This link indicates that some version of the chip worked on some Linux machines at some point in time: 

https://linux-hardware.org/index.php?id=usb:0d8c-013c


More links:

http://www.linux-usb.org/USB-guide/x319.html

https://linux-hardware.org/index.php?id=usb:0d8c-013c
There are several links for people with Raspberry Pi boards running Raspian. They made changes to their ALSA configuration to use a CM108 USB audio interface. I don't know if those instructions apply to Debian.
Please run the following commands, and cut and past the commands and their outputs into a reply: 

cat /etc/debian_version

uname -a

dmesg | grep -i cm108 -A 10 -B 10


David
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