Public bug reported:

1) Description: Ubuntu 16.04.2 LTS
Release:        16.04

2) alsa-base:
  Installed: 1.0.25+dfsg-0ubuntu5
  Candidate: 1.0.25+dfsg-0ubuntu5
  Version table:
 *** 1.0.25+dfsg-0ubuntu5 500
        500 http://us.archive.ubuntu.com/ubuntu xenial/main amd64 Packages
        500 http://us.archive.ubuntu.com/ubuntu xenial/main i386 Packages
        100 /var/lib/dpkg/status

3) I expected to have working sound. On an upgrade from 14.04 LTS I
would get an occasional pop or intro sound as Ubuntu booted up and then
it would be silent. I worked through all of the sound guides I could but
nothing worked. Actually, now I don't even get any sound at all.

4) Silence will fall when the question is asked, happened.

ProblemType: Bug
DistroRelease: Ubuntu 16.04
Package: alsa-base 1.0.25+dfsg-0ubuntu5
ProcVersionSignature: Ubuntu 4.4.0-82.105-generic 4.4.70
Uname: Linux 4.4.0-82-generic x86_64
ApportVersion: 2.20.1-0ubuntu2.7
Architecture: amd64
AudioDevicesInUse:
 USER        PID ACCESS COMMAND
 /dev/snd/controlC0:  geoffrey   2180 F.... pulseaudio
CurrentDesktop: Unity
Date: Sat Jun 24 22:50:06 2017
InstallationDate: Installed on 2013-08-06 (1418 days ago)
InstallationMedia: Ubuntu 12.04.2 LTS "Precise Pangolin" - Release amd64 
(20130213)
PackageArchitecture: all
ProcEnviron:
 LANGUAGE=en_US
 PATH=(custom, no user)
 XDG_RUNTIME_DIR=<set>
 LANG=en_US.UTF-8
 SHELL=/bin/bash
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/controlC0:  geoffrey   2180 F.... pulseaudio
Symptom_Jack: Speaker, Internal
Symptom_Type: No sound at all
Title: [Satellite L745, Conexant CX20585, Speaker, Internal] No sound at all
UpgradeStatus: Upgraded to xenial on 2017-06-13 (11 days ago)
dmi.bios.date: 06/26/2012
dmi.bios.vendor: INSYDE
dmi.bios.version: 2.60
dmi.board.asset.tag: Base Board Asset Tag
dmi.board.name: Base Board Product Name
dmi.board.vendor: Intel Corp.
dmi.board.version: Base Board Version
dmi.chassis.asset.tag: No Asset Tag
dmi.chassis.type: 10
dmi.chassis.vendor: OEM Chassis Manufacturer
dmi.chassis.version: OEM Chassis Version
dmi.modalias: 
dmi:bvnINSYDE:bvr2.60:bd06/26/2012:svnTOSHIBA:pnSatelliteL745:pvrPSK0YU-0D102G:rvnIntelCorp.:rnBaseBoardProductName:rvrBaseBoardVersion:cvnOEMChassisManufacturer:ct10:cvrOEMChassisVersion:
dmi.product.name: Satellite L745
dmi.product.version: PSK0YU-0D102G
dmi.sys.vendor: TOSHIBA
mtime.conffile..etc.modprobe.d.alsa-base.conf: 2017-06-24T22:42:56.987018

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


** Tags: amd64 apport-bug third-party-packages xenial

** Attachment added: "hardware.txt"
   
https://bugs.launchpad.net/bugs/1700318/+attachment/4902593/+files/hardware.txt

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https://bugs.launchpad.net/bugs/1700318

Title:
  [Satellite L745, Conexant CX20585, Speaker, Internal] No sound at all

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