Seems that it still breaks:
https://www.reddit.com/r/linuxhardware/comments/f37ypz/audio_stopped_working_after_upgrade_from_50037/

And nic30 solution either works for me, previously after upgrading
kernel I had problems with sound but downgrade was bringing sound back.
For now, it's not working on my company M4800, but I need audio because
I talk with clients.

I have Nvidia 440.
Thanks!

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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/1786495

Title:
  [Precision M4800, Realtek ALC3226, Green Headphone Out, Front] No
  sound at all

Status in alsa-driver package in Ubuntu:
  Confirmed

Bug description:
  I am head no sound from my headphone jack. Laptop speaker work fine.
  Tried 2 different headphones and still no sound. pavucontrol can see
  my headphone and I see the sound bar move but no sound comes out.

  ProblemType: Bug
  DistroRelease: Ubuntu 18.04
  Package: alsa-base 1.0.25+dfsg-0ubuntu5
  ProcVersionSignature: Ubuntu 4.15.0-30.32-generic 4.15.18
  Uname: Linux 4.15.0-30-generic x86_64
  NonfreeKernelModules: nvidia_modeset nvidia
  ApportVersion: 2.20.9-0ubuntu7.2
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/pcmC1D0p:   hhernandez   2083 F...m pulseaudio
   /dev/snd/controlC1:  hhernandez   2083 F.... pulseaudio
   /dev/snd/controlC0:  hhernandez   2083 F.... pulseaudio
  CurrentDesktop: MATE
  Date: Fri Aug 10 07:59:09 2018
  PackageArchitecture: all
  SourcePackage: alsa-driver
  Symptom: audio
  Symptom_AlsaPlaybackTest: ALSA playback test through plughw:PCH failed
  Symptom_Card: Built-in Audio - HDA Intel PCH
  Symptom_DevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC1:  hhernandez   2083 F.... pulseaudio
   /dev/snd/controlC0:  hhernandez   2083 F.... pulseaudio
  Symptom_Jack: Green Headphone Out, Front
  Symptom_Type: No sound at all
  Title: [Precision M4800, Realtek ALC3226, Green Headphone Out, Front] No 
sound at all
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 05/19/2015
  dmi.bios.vendor: Dell Inc.
  dmi.bios.version: A14
  dmi.board.name: 0V5GVY
  dmi.board.vendor: Dell Inc.
  dmi.board.version: A00
  dmi.chassis.type: 9
  dmi.chassis.vendor: Dell Inc.
  dmi.modalias: 
dmi:bvnDellInc.:bvrA14:bd05/19/2015:svnDellInc.:pnPrecisionM4800:pvr01:rvnDellInc.:rn0V5GVY:rvrA00:cvnDellInc.:ct9:cvr:
  dmi.product.name: Precision M4800
  dmi.product.version: 01
  dmi.sys.vendor: Dell Inc.

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