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I'm having an issue using my internal microphone. First time I noticed it was yesterday when I had a group call on Google Hangouts. After thorough research into this, I discovered that my problem was that one of my mic channels was phase inverted from the other, and thus the two channels were effectively cancelling each other out.

The mic would work if I used sudo pavucontrol to unlock the channels and mute one of them out (and thus it would serve as a ground reference for the other channel), but the thing is that most apps (e.g.: Chrome, Skype) would auto-adjust the mic gain and re-lock the mic channels together, and thus the problem would persist. I tried everything I could to mitigate the issue, but nothing really worked. Also, I found out that this bug goes back as early as 6 years ago, and still no solution is available anywhere.

Reference: https://bugs.launchpad.net/ubuntu/+source/alsa-driver/+bug/1002978

  • Found a way to mitigate this by running while sleep 0.2; do pactl set-source-volume <your mic device> 40% 10%; done. This would reset the mic channel volume every 0.2 seconds to 40% (left) and 10% (right), I found out that these values give the best audio quality. Still looking for the ultimate answer.. – scorpion9979 Oct 21 '18 at 15:16
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I was facing with this same issue till yesterday on the new lenovo ideapad 320. I did the pavucontrol to unlock the channels and mute one of them, followed by

editing /usr/share/pulseaudio/alsa-mixer/paths/analog-input-internal-mic.conf Under [Element Internal Mic Boost] set volume to zero. Under [Element Int Mic Boost] set volume to zero. Under [Element Mic Boost] set volume to zero.

reference : https://wiki.archlinux.org/index.php/PulseAudio/Troubleshooting#Microphone_distorted_due_to_automatic_adjustment Credits to https://forums.linuxmint.com/viewtopic.php?t=183740

Tried with skype echo test service. Hope this helps.

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