An error is thrown:
$ alsactl store -f abc.txt
alsactl: get_control:256: Cannot read control '2,0,0,PCM Capture Source,0':
Broken pipe
Also, one clue: in the external sound card (the hardware element) I have a
switcher: USB Audio 2.0 and USB Audio 1.0.
When 2.0 is selected the laptop recognizes it as "Xonar U7". The error
appears only when 2.0 is selected.
If I select 1.0 the laptop recognizes it as "USB Audio Device" - the
error does NOT appear. I can select it.
Is this helpful? What is USB Audio must I choose?
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https://bugs.launchpad.net/bugs/1267866
Title:
Broken pipelline when changing the sound card
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