Comment 0 for bug 1871306

Asus C300 (repurposed chromembook - bios flashed by Mr.Chromebox script) - Kubuntu Focal minimal fresh installation.
The sound card is detected: I see it in the Plasma Widget, in pavucontrol, in alsamixer and it's not muted.
I tried and add in /usr/share/alsa/ucm/chtmax98090/ the old style use case config files: no success.
I tried and unmute speakers left and right in alsamixer: no success.

I rapidly tested Ubuntu Mate Focal fresh install: I had exactly the same issue.

I'm running on the same rig Debian Bullseye, kernel 5.4: sound card output and input are both working perfectly - I noticed that in Kubuntu alsamixer Kubuntu when I open it I have an entry HDA IntelPCH (the HDMI card), while in Debian I find Pulseaudio.

I attach the alsa-info.sh output.

ProblemType: Bug
DistroRelease: Ubuntu 20.04
Package: ubuntu-release-upgrader-core 1:20.04.17
ProcVersionSignature: Ubuntu 5.4.0-21.25-generic 5.4.27
Uname: Linux 5.4.0-21-generic x86_64
ApportVersion: 2.20.11-0ubuntu24
Architecture: amd64
CrashDB: ubuntu
CurrentDesktop: KDE
Date: Tue Apr 7 08:55:46 2020
InstallationDate: Installed on 2020-04-04 (2 days ago)
InstallationMedia: Kubuntu 20.04 LTS "Focal Fossa" - Beta amd64 (20200401)
PackageArchitecture: all
SourcePackage: ubuntu-release-upgrader
Symptom: dist-upgrade
UpgradeStatus: No upgrade log present (probably fresh install)