[pulseaudio-discuss] Sound input problem on chtrt5645 device

[Tanu Kaskinen]

On Wed, 2018-06-27 at 10:10 -0300, Gustavo Duarte wrote:
> On Fri, 2018-06-15 at 12:56 -0300, Gustavo Duarte wrote:
> >* Hi all,
> *> >* The input sound isn't working. No sound is detected.
> *> >* Environment:
> *> >* Laptop brand: JP Couto model EF20EA
> *> >* Distributor ID: Ubuntu
> *>* Description: Ubuntu 16.04.4 LTS
> *>* Release: 16.04
> *>* Codename: xenial
> *> >* Linux Kernel: 4.15.0-23-generic
> *> >* Right after install Ubuntu 16.04 on the laptop, the sound output and input
> *>* isn't worked.
> *> >* So i followed this procedure:
> *>* https://ubuntuforums.org/showthread.php?t=2374383&p=13698722#post13698722
> <https://ubuntuforums.org/showthread.php?t=2374383&p=13698722#post13698722>
> *>* and then, output sound starting to work, but input not.
> *> >* An strange thing is that output of amixer -cO is empty.
> *
> On your machine card 0 is HDMI, which is why amixer -c0 is empty.
> amixer -c1 will show the chtrt5645 mixer settings.
> 
> There have been input related fixes to chtrt5645's UCM config recently.
> This is the latest
> version:http://git.alsa-project.org/?p=alsa-lib.git;a=blob_plain;f=src/conf/ucm/chtrt5645/HiFi.conf;hb=HEAD
> 
> Try copying that to /usr/share/alsa/ucm/chtrt5645/HiFi.conf
> 
> -- 
> Tanu
> 
> 
> I tried this fix, after substitute HiFI.conf file and reboot the laptop,
> sound configuration options changed, output sound still working, but input
> NOT.
> 
> Something else to do ?
> 
> Thanks.

Apparently your laptop requires some special configuration for the mic
to work. There are a couple of different rt5645 UCM configurations
already in alsa-lib:
http://git.alsa-project.org/?p=alsa-lib.git;a=tree;f=src/conf/ucm;hb=HEAD

You can try playing with "alsamixer -c1" to find out what settings need
to be changed. If you manage to find a working settings, then the UCM
configuration can be fixed.

I'll add Hans de Goede to Cc in case he has any hints or is otherwise
interested (he has fixed input for some other laptops that use rt5645).

By the way, it would be good if you could fix your quoting style (and
preferably send plain text emails instead of html). Currently it's hard
to see from your email where the quoted part ends and your own text
begins.

-- 
Tanu

https://liberapay.com/tanuk
https://www.patreon.com/tanuk