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I am using Cisco Webex for the online meetings, the problem is that the microphone volume automatically goes to maximum and I just can't decrease it. Is there any way to solve this problem? Any help would be highly appreciated!

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I had a similar problem. Sometimes it is impossible to prevent applications from trying to adjust the microphone level. With Ubuntu, it is at least possible to prevent ALSA from responding to such requests.

In the configuration file /usr/share/pulseaudio/alsa-mixer/paths/analog-input-internal-mic.conf (you might have to look for the correct file for your microphone), I changed to part

[Element Capture]
switch = mute
volume = merge
override-map.1 = all
override-map.2 = all-left,all-right

to

[Element Capture]
switch = mute
volume = 40
override-map.1 = all
override-map.2 = all-left,all-right

and after a sudo alsa force-reload, applications don't magically change the microphone volume anymore.

| improve this answer | |
  • This seems to work for me for Ubuntu 18.04. I came here via the Chromium bug closed as WontFix, in which Chromium refuses to allow users to disable automatic mic adjustment (in my case, the Mic Boost, not the absolute volume); instead they make it each WebRTC app's ability to disable it, but if any app you use there doesn't offer a setting for it, you're screwed. This workaround seems to help. However, even though I specify volume = 40 for my mic boost, the value stays at the value I set in alsamixer, not 40. Suspicious. – nh2 Nov 6 '19 at 0:13
  • I just noticed that I had answered the same question with the same answer here 3 years ago :o – nh2 Nov 6 '19 at 0:25

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