I have still the issue on 20.04. However, I had to add `options snd-hda-
intel dmic_detect=0` to `/etc/modprobe.d/alsa-base.conf` due to this
another issue: https://bugs.launchpad.net/ubuntu/+source/linux-oem-
osp1/+bug/1864061. What is the next step? Thank you.

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https://bugs.launchpad.net/bugs/1856392

Title:
  [HP ZBook 15 G6, Realtek ALC285, Black Mic, Right] Microphone not
  detected

Status in alsa-driver package in Ubuntu:
  Incomplete
Status in linux package in Ubuntu:
  Incomplete

Bug description:
  Hello,
  on a brand new HPZbook15G6, with a fresh dual boot 19.10 Ubuntu install, I 
have no internal mic detected.
  The GNOME settings sound entry list is empty. Speaker sound is working 
properly.

  When hooking a microphone enabled headphone on the jack plug, the
  headphones mic is then detected, but there is now no sound output on
  the headphone.

  I've been looking for a few similar issues on recent (HP or not)
  laptops and found a few similar issues :

  Bug #1523100
  Bug #1837821

  so I guess this is a generic alsa or snd-hda-intel issue with newer ALC2xx 
hardware.
  I already tryed quite a few of the workaroubds/fix available here and there 
(e.g. overriding pin with hdajackretask, adding options to snd-hda-intel module 
etc. none with success)

  I'm available to test/provide any additional needed data.

  ProblemType: Bug
  DistroRelease: Ubuntu 19.10
  Package: alsa-base 1.0.25+dfsg-0ubuntu5
  ProcVersionSignature: Ubuntu 5.3.0-24.26-generic 5.3.10
  Uname: Linux 5.3.0-24-generic x86_64
  NonfreeKernelModules: nvidia_modeset nvidia
  ApportVersion: 2.20.11-0ubuntu8.2
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC1:  mathieu    1719 F.... pulseaudio
   /dev/snd/controlC0:  mathieu    1719 F.... pulseaudio
  CurrentDesktop: ubuntu:GNOME
  Date: Sat Dec 14 13:33:14 2019
  InstallationDate: Installed on 2019-12-13 (0 days ago)
  InstallationMedia: Ubuntu 19.10 "Eoan Ermine" - Release amd64 (20191017)
  PackageArchitecture: all
  ProcEnviron:
   TERM=xterm-256color
   PATH=(custom, no user)
   XDG_RUNTIME_DIR=<set>
   LANG=fr_FR.UTF-8
   SHELL=/bin/bash
  SourcePackage: alsa-driver
  Symptom: audio
  Symptom_AlsaRecordingTest: ALSA recording test through plughw:PCH successful
  Symptom_Card: Audio interne - HDA Intel PCH
  Symptom_Jack: Black Mic, Right
  Symptom_PulseAudioRecordingTest: PulseAudio recording test through plughw:PCH 
successful
  Symptom_Type: Only some of inputs are working
  Title: [HP ZBook 15 G6, Realtek ALC285, Black Mic, Right] Recording problem
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 11/06/2019
  dmi.bios.vendor: HP
  dmi.bios.version: R92 Ver. 01.03.04
  dmi.board.name: 860F
  dmi.board.vendor: HP
  dmi.board.version: KBC Version 65.23.00
  dmi.chassis.asset.tag: 5CD944676Z
  dmi.chassis.type: 10
  dmi.chassis.vendor: HP
  dmi.modalias: 
dmi:bvnHP:bvrR92Ver.01.03.04:bd11/06/2019:svnHP:pnHPZBook15G6:pvr:rvnHP:rn860F:rvrKBCVersion65.23.00:cvnHP:ct10:cvr:
  dmi.product.family: 103C_5336AN HP ZBook
  dmi.product.name: HP ZBook 15 G6
  dmi.product.sku: 6VD99AV
  dmi.sys.vendor: HP
  mtime.conffile..etc.modprobe.d.alsa-base.conf: 2019-12-14T13:26:02.404591

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