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I want to activate a microphone on my machine via the command line. I use amixer for this. 

amixer set "Front Mic" 66%
amixer set "Digital" 100%
amixer set "Front Mic Boost" 100%
amixer set "Capture" 100%

This set the volume settings. The problem is that capture is deactivated. Amixer displays this output:

Simple mixer control 'Capture',0 Capabilities: cvolume cswitch Capture channels: Front Left - Front Right Limits: Capture 0 - 54 Front Left: Capture 27 [50%] [-18.00dB] [off] Front Right: Capture 27 [50%] [-18.00dB] [off]

I can active capture via kmix after that amixer shows the channels as on. But the man pages don't show how to activate the channels via amixer.

Janusz
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1 Answers1

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Capture is activated via the following command:

amixer set "Capture" cap
Janusz
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  • Brilliant. I didn't know that capture mode could be "off", although there is no visible indicator in `alsamixer`. In my case, a Cmedia 6206 based card, apart from setting `PCM Capture Source` (which can be done in `alsamixer`), I had to additionally "enable" the Line input (a dedicated control), using `amixer -c1 set Line cap`. –  May 29 '20 at 10:56