[alsa-devel] External sound card issue

Clemens Ladisch clemens at ladisch.de
Sun Jan 26 19:01:31 CET 2014

Ionica Bizau wrote:
> $ amixer -c1 cget name='PCM Capture Source'
> numid=7,iface=MIXER,name='PCM Capture Source'
>   ; type=ENUMERATED,access=rw------,values=1,items=2
>   ; Item #0 'Unit 22'
>   ; Item #1 'Unit 22'
> amixer: Control hw:1 element read error: Broken pipe

The device's firmware does not allow reading this mixer control for some
reason; this is probably a bug.

Please try the following commands:
  rmmod snd-usb-audio
  modprobe snd-usb-audio ignore_ctl_error=1

This makes the driver ignore errors, but cannot prevent the errors from
happening in the first place.  Please check if you get the desired
effect when you write this control.


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