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!
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, see below), I changed to part
[Element Capture] switch = mute volume = merge override-map.1 = all override-map.2 = all-left,all-right
[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.
If you want to set the volume to the "native" volume of your microphone (0dB of the hardware, without added "mic boost" that can add static noise), adjust this volume number until the top left of
db gain: 0.00, like so:
How to determine the
.conf file for your microphone
In the output, search for the
index:section listing the desired device, e.g.
* index: 6 name: <alsa_input.usb-Blue_Microphones_Yeti_Stereo_Microphone_REV8-00.analog-stereo> ... active port: <analog-input-mic>
active portpart at the end contains the file name you need to edit in
In the above example, it is
<analog-input-mic>, so we would edit
/usr/share/pulseaudio/alsa-mixer/paths/analog-input-mic.conffor this mic.