This was also affecting me, causing very loud hissing on Skype calls.
The change in
https://bugs.launchpad.net/ubuntu/+source/pulseaudio/+bug/1085402/comments/6
fixes it for me, that is, in /usr/share/pulseaudio/alsa-mixer/paths
/analog-input-mic.conf in the [Element Mic Boost] section, change
volume = merge to volume = zero and restart Pulseaudio (sudo pkill
pulseaudio) then restart Skype.
I also had to manually set the Mic Boost values to zero in alsamixer
(F6, change card, HDA Intel PCH).
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https://bugs.launchpad.net/bugs/1085402
Title:
PulseAudio overuses 'Boost' control of microphone input producing bad
audio quality
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