Public bug reported:

Steps to reproduce

* Attach an external HDMI/DP monitor to watch videos on an external display (TV)
* In sound settings, send audio to HDMI out, rather than internal laptop audio
* Play a video, to show audio is going over HDMI
* Unplug HDMI/DP cable
 - Video switches to internal panel only as expected.

Expected behaviour

* Audio switches to internal sound card

Actual behaviour

* Audio does not auto switch

Workaround

* Go to sound settings panel every time, and click the internal sound
card

Video showing it: https://www.youtube.com/watch?v=UR3LP0INMeI

ProblemType: Bug
DistroRelease: Ubuntu 17.10
Package: pulseaudio 1:10.0-2ubuntu2
ProcVersionSignature: Ubuntu 4.11.0-13.19-generic 4.11.12
Uname: Linux 4.11.0-13-generic x86_64
ApportVersion: 2.20.6-0ubuntu5
Architecture: amd64
AudioDevicesInUse:
 USER        PID ACCESS COMMAND
 /dev/snd/controlC0:  alan       1568 F.... pulseaudio
 /dev/snd/controlC1:  alan       1568 F.... pulseaudio
CurrentDesktop: ubuntu:GNOME
Date: Wed Aug 16 11:11:45 2017
InstallationDate: Installed on 2017-08-02 (13 days ago)
InstallationMedia: Ubuntu 17.10 "Artful Aardvark" - Alpha amd64 (20170712)
SourcePackage: pulseaudio
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 01/27/2016
dmi.bios.vendor: LENOVO
dmi.bios.version: JBET56WW (1.21 )
dmi.board.asset.tag: Not Available
dmi.board.name: 20BV001BUK
dmi.board.vendor: LENOVO
dmi.board.version: 0B98417 WIN
dmi.chassis.asset.tag: No Asset Information
dmi.chassis.type: 10
dmi.chassis.vendor: LENOVO
dmi.chassis.version: None
dmi.modalias: 
dmi:bvnLENOVO:bvrJBET56WW(1.21):bd01/27/2016:svnLENOVO:pn20BV001BUK:pvrThinkPadT450:rvnLENOVO:rn20BV001BUK:rvr0B98417WIN:cvnLENOVO:ct10:cvrNone:
dmi.product.name: 20BV001BUK
dmi.product.version: ThinkPad T450
dmi.sys.vendor: LENOVO

** Affects: pulseaudio
     Importance: Unknown
         Status: Unknown

** Affects: pulseaudio (Ubuntu)
     Importance: High
         Status: Triaged


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

** Bug watch added: freedesktop.org Bugzilla #96211
   https://bugs.freedesktop.org/show_bug.cgi?id=96211

** Also affects: pulseaudio via
   https://bugs.freedesktop.org/show_bug.cgi?id=96211
   Importance: Unknown
       Status: Unknown

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https://bugs.launchpad.net/bugs/1711101

Title:
  Audio doesn't auto switch when unplugging hdmi

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