Any chance to fix inverted internal microphone on Lenovo B50-70 /comment #47/.
Can you add a quirk, please.
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[meta-bug] Inverted Internal microphone (phase inversion)
Status in alsa-driver package in Ubuntu:
This is a metabug for all machines that are having phase inverted
If your internal mic is either completely silent (no signal), or you
can possibly pick a very small sound, with much background noise, even
though you have set gain to maximum, there is something you could try.
Install the pavucontrol application, start it and go to the "Input Devices"
tab. Unlock the channels (there is a keylock icon), then mute the right channel
while keeping the left channel at the volume you want.
If the internal mic is now working correctly, you have an inverted internal
mic, so that your right channel cancels out the left one.
(If you're not running PulseAudio, you can try doing the same through
AlsaMixer instead (see https://wiki.ubuntu.com/Audio/Alsamixer ), try
changing "Capture" level or "Internal Mic" or "Internal Mic Boost"
using the Q,E,Z,C keys.)
If so, please file a separate bug against the alsa-driver for your
issue, make sure hardware info gets attached to it (either alsa-info
as per https://wiki.ubuntu.com/Audio/AlsaInfo or the standard ones
that follows when you do "ubuntu-bug alsa-driver" ), then write a
comment in this bug, with your machine name and a pointer to the other
As time permits, I'll try to work on fixing them for the next Ubuntu release.
-- David Henningsson
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