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In
/usr/share/pulseaudio/alsa-mixer/paths/analog-input-internal-mic.confand/usr/share/pulseaudio/alsa-mixer/paths/analog-input-mic.conf, -
Under
[Element Internal Mic Boost]set volume tozero. -
Under
[Element Int Mic Boost]set volume tozero. -
Under
[Element Mic Boost]setvolumetozero -
Find your source name from the following command; mine is
alsa_input.pci-0000_00_1f.3.analog-stereo$ pacmd list-sources | grep 'name:.*input' -
Edit
/etc/pulse/default.paand add the following lines, whereINPUT_NAMEis name of the input source from above step:
load-module module-remap-source source_name=record_mono master=INPUT_NAME master_channel_map=front-left channel_map=mono
set-default-source record_mono
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Then restart PulseAudio:
$ pulseaudio -k $ pulseaudio --start