Thanks for the update.
• Removed the previous kernel with sudo dpkg -r --force-all 
linux-image-unsigned-5.4.0-25-generic
• Downloaded and installed v3 with sudo dpkg -i *.dev. Got

------
Processing triggers for linux-image-unsigned-5.4.0-25-generic 
(5.4.0-25.29+skiphdmiv3) ...
/etc/kernel/postinst.d/dkms:
 * dkms: running auto installation service for kernel 5.4.0-25-generic
ACPI disabled in this kernel, not building module.
Error!  The /var/lib/dkms/acpi-call/1.1.0/5.4.0-25-generic/x86_64/dkms.conf for 
module acpi-call includes a BUILD_EXCLUSIVE directive which
does not match this kernel/arch.  This indicates that it should not be built.
Error! Your kernel headers for kernel 5.4.0-25-generic cannot be found.
Please install the linux-headers-5.4.0-25-generic package,
or use the --kernelsourcedir option to tell DKMS where it's located
-----

• Anyway, I proceeded. Comment out "options snd-intel-dspcfg dsp_driver=1
" in alsa-base.conf. And rebooted.
* No sound. "Dummy output" on pavucontrol
* Attaching full dmesg log and alsa-info: 
http://alsa-project.org/db/?f=8c55fd41cbd662c08dd8a21bf8d73817dbb8b7d2
* alsa -l: the -l flag is not a valid option for alsa command on my system. 

---- 
wittawat@omen:~$ inxi -Ax
Audio:     Device-1: Intel Cannon Lake PCH cAVS vendor: Hewlett-Packard driver: 
sof-audio-pci bus ID: 00:1f.3 
           Device-2: NVIDIA TU106 High Definition Audio vendor: Hewlett-Packard 
driver: snd_hda_intel v: kernel 
           bus ID: 01:00.1 
           Sound Server: ALSA v: k5.4.0-25-generic 
----

* This report is based on Hdmi.conf on my machine. I can try Hdmi.conf
that you sent. Will post again.

* By the way, in all versions of the 5.4.0-25 kernel you sent, I could
not change the brightness of my display. I guess there is something to
do with ACPI.

Thanks.


** Attachment added: "dmesg"
   
https://bugs.launchpad.net/ubuntu/+source/alsa-driver/+bug/1874698/+attachment/5363942/+files/dmesg_5.4.0-25_v3.log

-- 
You received this bug notification because you are a member of Ubuntu
Touch seeded packages, which is subscribed to alsa-driver in Ubuntu.
https://bugs.launchpad.net/bugs/1874698

Title:
  [OMEN by HP Laptop 15-dh0xxx, Realtek ALC285, Black Mic, Left]
  Recording problem

Status in alsa-driver package in Ubuntu:
  New

Bug description:
  On Ubuntu 20.04, by default, sof-audio-pci is used. I only have "Dummy
  output" in pavucontrol. To fix this, I modified /etc/modprobe.d/alsa-
  base.conf and added "options snd-intel-dspcfg dsp_driver=1" so that
  now "snd-hda-intel" is loaded instead of sof-audio-pci. While the
  speakers are working fine, I do not have the internal microphone
  working (suspect a digital array).

  ProblemType: Bug
  DistroRelease: Ubuntu 20.04
  Package: alsa-base 1.0.25+dfsg-0ubuntu5
  ProcVersionSignature: Ubuntu 5.4.0-26.30-generic 5.4.30
  Uname: Linux 5.4.0-26-generic x86_64
  NonfreeKernelModules: nvidia_modeset nvidia
  ApportVersion: 2.20.11-0ubuntu27
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC1:  wittawat   2063 F.... pulseaudio
   /dev/snd/controlC0:  wittawat   2063 F.... pulseaudio
  CasperMD5CheckResult: skip
  CurrentDesktop: ubuntu:GNOME
  Date: Fri Apr 24 12:42:32 2020
  InstallationDate: Installed on 2020-04-23 (0 days ago)
  InstallationMedia: Ubuntu 20.04 LTS "Focal Fossa" - Release amd64 (20200423)
  PackageArchitecture: all
  SourcePackage: alsa-driver
  Symptom: audio
  Symptom_AlsaRecordingTest: ALSA recording test through plughw:PCH failed
  Symptom_Card: Built-in Audio - HDA Intel PCH
  Symptom_Jack: Black Mic, Left
  Symptom_Type: None of the above
  Title: [OMEN by HP Laptop 15-dh0xxx, Realtek ALC285, Black Mic, Left] 
Recording problem
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 12/09/2019
  dmi.bios.vendor: AMI
  dmi.bios.version: F.22
  dmi.board.asset.tag: Base Board Asset Tag
  dmi.board.name: 8600
  dmi.board.vendor: HP
  dmi.board.version: 44.41
  dmi.chassis.type: 10
  dmi.chassis.vendor: HP
  dmi.chassis.version: Chassis Version
  dmi.modalias: 
dmi:bvnAMI:bvrF.22:bd12/09/2019:svnHP:pnOMENbyHPLaptop15-dh0xxx:pvr:rvnHP:rn8600:rvr44.41:cvnHP:ct10:cvrChassisVersion:
  dmi.product.family: 103C_5335KV HP OMEN
  dmi.product.name: OMEN by HP Laptop 15-dh0xxx
  dmi.product.sku: 7JX54EA#ABD
  dmi.sys.vendor: HP
  mtime.conffile..etc.modprobe.d.alsa-base.conf: 2020-04-24T12:32:21.613996

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