[HDA-Intel - HD-Audio Generic, recording] Recording problem: Headset mic not detected

[Lorenzo Tapia Schulze]

In my laptop (Huawei MateBook 14 2020 AMD R5, Model KLVL-WFH9) there is a single 3.5mm jack port which allows audio input and output. I've got a headset with a single cable, sound can be heard very good, microphone is not detected.
The disk runs Windows 10 in one partition and in the other one Ubuntu 20.04. I also had trouble with Windows in recognizing the headset's mic but now that has been solved. However, in Ubuntu it is only detected and "categorized" as Headphone. There is no way to use the microphone of the headset.
I've tried to find some similar issues but nothing has helped me so far.
Thanks in advance,
Lorenzo

ProblemType: Bug
DistroRelease: Ubuntu 20.04
Package: alsa-base 1.0.25+dfsg-0ubuntu5
Uname: Linux 5.7.17-050717-generic x86_64
ApportVersion: 2.20.11-0ubuntu27.21
Architecture: amd64
CasperMD5CheckResult: skip
CurrentDesktop: ubuntu:GNOME
Date: Sun Jan 9 17:51:26 2022
InstallationDate: Installed on 2021-03-29 (286 days ago)
InstallationMedia: Ubuntu 20.04 LTS "Focal Fossa" - Beta amd64 (20200402)
PackageArchitecture: all
ProcEnviron:
 PATH=(custom, no user)
 XDG_RUNTIME_DIR=<set>
 LANG=de_DE.UTF-8
 SHELL=/bin/bash
SourcePackage: alsa-driver
Symptom: audio
Symptom_AlsaRecordingTest: ALSA recording test through plughw:Generic_1 successful
Symptom_Card: Family 17h (Models 10h-1fh) HD Audio Controller - HD-Audio Generic
Symptom_PulseAudioRecordingTest: PulseAudio recording test through plughw:Generic_1 failed
Symptom_Type: Only some of inputs are working
Title: [HDA-Intel - HD-Audio Generic, recording] Recording problem
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 09/14/2020
dmi.bios.vendor: HUAWEI
dmi.bios.version: 1.06
dmi.board.asset.tag: N/A
dmi.board.name: KLVL-WXX9-PCB
dmi.board.vendor: HUAWEI
dmi.board.version: M1130
dmi.chassis.asset.tag: N/A
dmi.chassis.type: 10
dmi.chassis.vendor: HUAWEI
dmi.chassis.version: M1130
dmi.modalias: dmi:bvnHUAWEI:bvr1.06:bd09/14/2020:svnHUAWEI:pnKLVL-WXX9:pvrM1130:rvnHUAWEI:rnKLVL-WXX9-PCB:rvrM1130:cvnHUAWEI:ct10:cvrM1130:
dmi.product.family: MateBook 14
dmi.product.name: KLVL-WXX9
dmi.product.sku: C100
dmi.product.version: M1130
dmi.sys.vendor: HUAWEI
mtime.conffile..etc.modprobe.d.alsa-base.conf: 2022-01-06T13:57:39.444454