Public bug reported:

Sound worked before, but after plugging in headphones, sound does not work 
through either headphones or internal speakers. Sound continues not to work 
after unplugging headphones.
I tried:
1. killall pulseaudio; rm -r ~/.config/pulse/* ; rm -r ~/.pulse*
2. wait 10 seconds 
3. reboot

Then sound worked in internal speakers, but when I plugged in
headphones, I got the same result. I tested the sound using "Test
Speakers" in Settings, and by playing youtube videos in Firefox.

ProblemType: Bug
DistroRelease: Ubuntu 17.10
Package: alsa-base 1.0.25+dfsg-0ubuntu5
ProcVersionSignature: Ubuntu 4.13.0-19.22-generic 4.13.13
Uname: Linux 4.13.0-19-generic x86_64
ApportVersion: 2.20.7-0ubuntu3.6
Architecture: amd64
AudioDevicesInUse:
 USER        PID ACCESS COMMAND
 /dev/snd/pcmC0D0c:   paul       1374 F...m pulseaudio
 /dev/snd/controlC0:  paul       1374 F.... pulseaudio
CurrentDesktop: ubuntu:GNOME
Date: Fri Dec 15 22:15:26 2017
InstallationDate: Installed on 2017-12-08 (7 days ago)
InstallationMedia: Ubuntu 17.10 "Artful Aardvark" - Release amd64 (20171018)
PackageArchitecture: all
ProcEnviron:
 TERM=xterm-256color
 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/pcmC0D0c:   paul       1374 F...m pulseaudio
 /dev/snd/controlC0:  gdm        1055 F.... pulseaudio
                      paul       1374 F.... pulseaudio
Symptom_Jack: Black Speaker, Internal
Symptom_Type: No sound at all
Title: [Precision 5510, Realtek ALC3266, Black Speaker, Internal] No sound at 
all
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 08/11/2017
dmi.bios.vendor: Dell Inc.
dmi.bios.version: 1.3.0
dmi.board.name: 0WVDX2
dmi.board.vendor: Dell Inc.
dmi.board.version: A03
dmi.chassis.type: 9
dmi.chassis.vendor: Dell Inc.
dmi.modalias: 
dmi:bvnDellInc.:bvr1.3.0:bd08/11/2017:svnDellInc.:pnPrecision5510:pvr:rvnDellInc.:rn0WVDX2:rvrA03:cvnDellInc.:ct9:cvr:
dmi.product.family: To be filled by O.E.M.
dmi.product.name: Precision 5510
dmi.sys.vendor: Dell Inc.

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


** Tags: amd64 apport-bug artful wayland-session

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https://bugs.launchpad.net/bugs/1738515

Title:
  [Precision 5510, Realtek ALC3266, Black Speaker, Internal] No sound at
  all after plugging in headphones

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