[pulseaudio-discuss] Sound input problem on chtrt5645 device.

Tanu Kaskinen tanuk at iki.fi
Mon Jun 18 13:20:15 UTC 2018

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
> 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:

Try copying that to /usr/share/alsa/ucm/chtrt5645/HiFi.conf



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