Public bug reported:

I have no idea, it has no sound lately.

ProblemType: Bug
DistroRelease: Ubuntu 16.04
Package: alsa-base 1.0.25+dfsg-0ubuntu5
ProcVersionSignature: Ubuntu 4.8.0-51.54~16.04.1-generic 4.8.17
Uname: Linux 4.8.0-51-generic x86_64
NonfreeKernelModules: nvidia_uvm nvidia_drm nvidia_modeset nvidia
ApportVersion: 2.20.1-0ubuntu2.5
Architecture: amd64
AudioDevicesInUse:
 USER        PID ACCESS COMMAND
 /dev/snd/pcmC1D0p:   giangdu    1758 F...m pulseaudio
 /dev/snd/controlC1:  giangdu    1758 F.... pulseaudio
 /dev/snd/controlC0:  giangdu    1758 F.... pulseaudio
CurrentDesktop: Unity
Date: Sun May  7 16:46:59 2017
InstallationDate: Installed on 2017-04-30 (7 days ago)
InstallationMedia: Ubuntu 16.04.2 LTS "Xenial Xerus" - Release amd64 
(20170215.2)
PackageArchitecture: all
SourcePackage: alsa-driver
Symptom: audio
Symptom_AlsaPlaybackTest: ALSA playback test through plughw:HDMI failed
Symptom_Card: Built-in Audio - HDA Intel HDMI
Symptom_DevicesInUse:
 USER        PID ACCESS COMMAND
 /dev/snd/pcmC1D0p:   giangdu    1758 F...m pulseaudio
 /dev/snd/controlC1:  giangdu    1758 F.... pulseaudio
 /dev/snd/controlC0:  giangdu    1758 F.... pulseaudio
Symptom_Jack: Digital Out, HDMI
Symptom_Type: No sound at all
Title: [Satellite P50-A, Intel Haswell HDMI, Digital Out, HDMI] No sound at all
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 09/19/2014
dmi.bios.vendor: TOSHIBA
dmi.bios.version: 1.90
dmi.board.asset.tag: ATN12345678901234567
dmi.board.name: VG10ST
dmi.board.vendor: TOSHIBA
dmi.board.version: To be filled by O.E.M.
dmi.chassis.asset.tag: No Asset Tag
dmi.chassis.type: 10
dmi.chassis.vendor: TOSHIBA
dmi.chassis.version: To Be Filled By O.E.M.
dmi.modalias: 
dmi:bvnTOSHIBA:bvr1.90:bd09/19/2014:svnTOSHIBA:pnSatelliteP50-A:pvrPSPMKU-00V002:rvnTOSHIBA:rnVG10ST:rvrTobefilledbyO.E.M.:cvnTOSHIBA:ct10:cvrToBeFilledByO.E.M.:
dmi.product.name: Satellite P50-A
dmi.product.version: PSPMKU-00V002
dmi.sys.vendor: TOSHIBA

** Affects: alsa-driver (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 apport-bug xenial

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https://bugs.launchpad.net/bugs/1689207

Title:
  [Satellite P50-A, Intel Haswell HDMI, Digital Out, HDMI] No sound at
  all

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