Corollary questions:

  • What is the location of the file?
  • Can it be used to deactivate the microphone?

This is for a Dell Latitude laptop.

  • Would you rather disable it / blacklist it permanently? – M. Becerra May 26 '17 at 20:18
  • Just disabling would be enough. – thnx-236659 May 26 '17 at 20:20
  • Did you try disabling it on Settings > Sound > Input ? The microphone is "controlled" by a kernel module, you could just disable the module for your laptop mic. – M. Becerra May 26 '17 at 20:27

You can use "pulseaudo" to achieve this purpose:

amixer -D pulse set Capture nocap

turns your mic off.

You can simply put it anywhere which will be run at start up, e.g: .profile.

If you want to turn it "on" again use:

amixer -D pulse set Capture cap

and for toggling between on and off:

amixer -D pulse set Capture toggle

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