Public bug reported:

For months, audio has been working fine on this Dell XPS13 laptop. It is a 
fresh install of 16.04, from around the time it was released. 
There were some pulseaudio updates installed on my machine today (see the 
attached apt term.log output). Since then, audio output has been unreliable. 
I've discussed this a small amount on AskUbuntu 
http://askubuntu.com/a/852277/237387
I found that running this command to reinstall the updated packages would 
sometimes bring back audio output - sometimes for a while, but sometimes only 
for a few seconds after a reboot. 
    sudo apt install --reinstall pulseaudio pulseaudio-utils pulseaudio-
module-bluetooth pulseaudio-module-x11 libpulse-mainloop-glib0 libpulse0
libpulsedsp

I can see Launchpad has several almost identical sounding bugs, from
many years ago. #461258, #926840, #926840, #995961, #1132982. None of
those were ever resolved. I hope this does not end the same way.

ProblemType: Bug
DistroRelease: Ubuntu 16.04
Package: pulseaudio 1:8.0-0ubuntu3.1
ProcVersionSignature: Ubuntu 4.4.0-47.68-generic 4.4.24
Uname: Linux 4.4.0-47-generic x86_64
ApportVersion: 2.20.1-0ubuntu2.1
Architecture: amd64
AudioDevicesInUse: Error: command ['fuser', '-v', '/dev/snd/by-path', 
'/dev/snd/hwC0D3', '/dev/snd/hwC0D0', '/dev/snd/pcmC0D3p', '/dev/snd/pcmC0D0c', 
'/dev/snd/pcmC0D0p', '/dev/snd/controlC0', '/dev/snd/seq', '/dev/snd/timer'] 
failed with exit code 1:
CurrentDesktop: Unity
Date: Tue Nov 22 23:13:26 2016
InstallationDate: Installed on 2016-05-17 (189 days ago)
InstallationMedia: Ubuntu 16.04 LTS "Xenial Xerus" - Release amd64 (20160420.1)
ProcEnviron:
 LANGUAGE=en_AU:en
 PATH=(custom, no user)
 XDG_RUNTIME_DIR=<set>
 LANG=en_AU.UTF-8
 SHELL=/bin/bash
SourcePackage: pulseaudio
Symptom: audio
Symptom_Card: HDA-Intel - HDA Intel PCH
Symptom_Jack: Speaker, Internal
Title: [Dell System XPS L322X, Realtek ALC3260, Speaker, Internal] Pulseaudio 
fails to detect card
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 04/18/2013
dmi.bios.vendor: Dell Inc.
dmi.bios.version: A08
dmi.board.name: 0WW7PG
dmi.board.vendor: Dell Inc.
dmi.board.version: A00
dmi.chassis.type: 8
dmi.chassis.vendor: Dell Inc.
dmi.chassis.version: 0.1
dmi.modalias: 
dmi:bvnDellInc.:bvrA08:bd04/18/2013:svnDellInc.:pnDellSystemXPSL322X:pvr:rvnDellInc.:rn0WW7PG:rvrA00:cvnDellInc.:ct8:cvr0.1:
dmi.product.name: Dell System XPS L322X
dmi.sys.vendor: Dell Inc.

** Affects: pulseaudio (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 apport-bug xenial

** Attachment added: "excerpt from apt term.log, from when pulseaudio was 
upgraded"
   https://bugs.launchpad.net/bugs/1643870/+attachment/4781479/+files/term.log

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https://bugs.launchpad.net/bugs/1643870

Title:
  Pulseaudio fails to detect card after recent update

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