I don't know if this will help anyone else arrive at a solution, but I observed
alsamixer while switching back and forth between non-speaker phone mode and
speaker phone mode in a phone call. While switching the mode I watched capture
"devices" (not sure of the correct term) DEC4 and DEC6 change gain amounts as
follows:
non-speaker phone mode
DEC4 at 68%, dB gain: 0.84
DEC6 at 80%, dB gain: 0.99
speaker phone mode
DEC4 at 70%, dB gain: 0.87
DEC6 at 68%, dB gain: 0.84
I'm learning about this on the fly because I'd like a solution, so I
have no idea what to do next but maybe someone else does.
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https://bugs.launchpad.net/bugs/1318360
Title:
Poor microphone quality (mako)
Status in pulseaudio package in Ubuntu:
Confirmed
Bug description:
After months of complaints from people talking to me on the phone
(mako ubuntu touch), I finally got around to use multiROM to dual boot
Ubuntu Touch and Android. Several people can confirm that there is a
noticable difference in terms of sound/microphone quality between
Android and UT in phone calls. With UT, my voice gets distorted to an
extent that person at the other end have real difficulties to hear
what I am saying, while with Android call quality is much better with
no distortion.
I have had a suspicion for a long time that this might be a software
and not a hardware issue. After trying Android and Ubuntu on the same
hardware I believe this suspicion is proved correct. This issue has
persisted in all the builds I have tried since at least the beginning
of the year, but probably longer. I am now at r17 of Utopic.
To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/pulseaudio/+bug/1318360/+subscriptions
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