Please try some older kernels and try to find out the last kernel
version where sound was working for you:

 https://kernel.ubuntu.com/~kernel-ppa/mainline/?C=N;O=D

** Summary changed:

- [MXG071, SigmaTel STAC9228, Speaker, Internal] No sound at all
+ [Dell MXG071, SigmaTel STAC9228, Speaker, Internal] No sound at all

** Changed in: alsa-driver (Ubuntu)
       Status: New => Incomplete

** Package changed: alsa-driver (Ubuntu) => linux (Ubuntu)

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https://bugs.launchpad.net/bugs/1829685

Title:
  [Dell MXG071, SigmaTel STAC9228, Speaker, Internal] No sound at all

Status in linux package in Ubuntu:
  Incomplete

Bug description:
  I had sound before the current Ubuntu upgrade. I have no sound with
  the latest upgrade Ubuntu 19.04. The soundbar seems to be working in
  the sound setting but receive no output sound at all. Any help will
  greatly be appreciated. Thanks

  ProblemType: Bug
  DistroRelease: Ubuntu 19.04
  Package: alsa-base 1.0.25+dfsg-0ubuntu5
  ProcVersionSignature: Ubuntu 5.0.0-16.17-generic 5.0.8
  Uname: Linux 5.0.0-16-generic x86_64
  NonfreeKernelModules: nvidia wl
  ApportVersion: 2.20.10-0ubuntu27
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC0:  joe        5605 F.... pulseaudio
  CurrentDesktop: ubuntu:GNOME
  Date: Sun May 19 22:12:48 2019
  InstallationDate: Installed on 2018-01-28 (476 days ago)
  InstallationMedia: Ubuntu 18.04 LTS "Bionic Beaver" - Release amd64 (20180426)
  PackageArchitecture: all
  SourcePackage: alsa-driver
  Symptom: audio
  Symptom_AlsaPlaybackTest: ALSA playback test through plughw:Intel failed
  Symptom_Card: Built-in Audio - HDA Intel
  Symptom_DevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC0:  root       1039 F.... pulseaudio
                        joe        5605 F.... pulseaudio
  Symptom_Jack: Speaker, Internal
  Symptom_Type: No sound at all
  Title: [MXG071, SigmaTel STAC9228, Speaker, Internal] No sound at all
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 04/23/2010
  dmi.bios.vendor: Dell Inc.
  dmi.bios.version: A11
  dmi.board.name: 345678
  dmi.board.vendor: Dell Inc.
  dmi.chassis.type: 8
  dmi.chassis.vendor: Dell Inc.
  dmi.modalias: 
dmi:bvnDellInc.:bvrA11:bd04/23/2010:svnDellInc.:pnMXG071:pvr:rvnDellInc.:rn345678:rvr:cvnDellInc.:ct8:cvr:
  dmi.product.name: MXG071
  dmi.sys.vendor: Dell Inc.

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