[alsa-devel] Cherry Trail + RT5645 devices analog microphone not working.
Hans de Goede
hdegoede at redhat.com
Sun Dec 24 11:42:59 CET 2017
Hi Bard,
I've been looking into getting the microphone to work on
some Cherry Trail + RT5645 devices with what appears to
be a simple analog microphone.
You can see the microphone on one of the models I'm trying
to get it to work on soldered onto the right side of the PCB
here: https://i.imgur.com/bJzBQWe.jpg
I'm using this ucm config:
https://fedorapeople.org/~jwrdegoede/chtrt5645/
Which is basically Pierre-Louis Bossart's config from:
https://github.com/plbossart/UCM
Adjusted because the devices all have a mono speaker.
I've been trying to get this to work myself and I can get
some sound while recording by adding:
cset "name='RECMIXL BST2 Switch' on"
cset "name='RECMIXR BST2 Switch' on"
But then I mainly get noise, I do get some sound from the
microphone if I talk really really loudly, but it is
barely above the noise-floor. I've the feeling that BST2
is only picking up the microphone via cross-talk and
that BST1 indeed is the correct input, but for some reason
I get complete silence when recording when only BST1 is
selected in the RECMIXR, and yes I've checked / set the
"IN1 boost volume".
TL;DR: I'm trying to get an analog mic to work on 3
different models Cherry Trail + RT5645 devices and I've
been unable to get this to work. I've put a registerdump
of the rt5645 with gnome-sound-recorder running here:
https://fedorapeople.org/~jwrdegoede/rt5645-mic-red.dump
Any insights / help with this would be very much
welcome.
Regards,
Hans
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