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[David Chatterton <dmchatterton@xxxxxxxxxx>]

Just another observation:

I stopped the video playout through the TV set and unplugged the Display
Port.

I then did a Shut Down followed by a cold start. Having opened the System Settings > Sound pane, I plugged in the Display Port connector and, miraculously, the HDMI option appeared in the Play sound through listing. Selecting the Digital Stereo (HDMI), I was able to successfully test to output using the Test Sound button. I managed to upset it by selecting the Digital Surround 5.1 option which it did not like. I could not set it back to Digital Stereo and the sound remained connected to the internal speakers. I started the VLC player but found that the HDMI option was no longer listed under the Audio > Audio Devices list.  Since this was probably an unfair test, I did a shut down and a cold start to attempt to recover normality.
 
On plugging in the Display Port (connected to an HDMI TV set), the Digital Stereo output reappeared in the listing and I was able to test the sound accordingly through the TV set - without any playout apps running. Starting Videos, I was able to direct its sound output either through the speakers or through the TV set.

I have therefore been unable to reproduce the original fault. I could
assume that the system keeps some history of what has been connected in
the past and uses this to expidite connection to connected devices, as
it seems to do with previously paired Bluetooth headphones.

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https://bugs.launchpad.net/bugs/1402666

Title:
  [XPS13 9333, Intel Haswell HDMI, Digital Out, HDMI] Playback problem

Status in alsa-driver package in Ubuntu:
  Incomplete

Bug description:
  If an HDMI monitor is plugged into the video out and the Videos app is
  started, the Systems Settings > Sound > Output shows only the
  Speakers, Built-in Audio in the Play sound through listing. The HDMI
  option is not presented.

  The workaround is to open the VLC app which lists the Built-in Stereo (HDMI) option under its Audio > Audio Devices menu.
   
  When a video is started in VLC, having selected the HDMI option, the sound plays through the monitor speakers. The HDMI / Display Port , Built-in Audio item then appears in the Play sound through window, even though the selection highlight remains on Speakers. The sound output can be switched between either output by highlighting the chosen option.

  If VLC is closed and Videos is restarted, the sound now plays through
  the previously selected HDMI item and can be switched between the
  monitor and the laptop's speakers.

  What I regard as a bug is the failure of the HDMI option to appear in
  the Play sound through listing as soon as an HDMI monitor is plugged
  into the Display Port output. Obviously, VLC has the means to add this
  item but the Videos app does not seem to be able to do this by itself.

  In contrast, as soon as a previously paired set of Bluetooth headphone
  are turned on, the Headset does appear as a menu item in the listing.
  I would reasonably expect the plugging in of an HDMI monitor into the
  Display Port to automatically add this item as well as its affects on
  the Screen Display pane of Systems Settings.

  Note: the laptop is running Ubuntu 14.10 and the Linux kernel has
  recently been upgraded to v3.18 (Vivid).

  ProblemType: Bug
  DistroRelease: Ubuntu 14.10
  Package: alsa-base 1.0.25+dfsg-0ubuntu4
  Uname: Linux 3.18.0-031800-generic x86_64
  ApportVersion: 2.14.7-0ubuntu8
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/pcmC1D0c:   david      2242 F...m pulseaudio
   /dev/snd/controlC1:  david      2242 F.... pulseaudio
   /dev/snd/controlC0:  david      2242 F.... pulseaudio
  CurrentDesktop: Unity
  Date: Mon Dec 15 13:13:47 2014
  InstallationDate: Installed on 2014-12-11 (3 days ago)
  InstallationMedia: Ubuntu 14.04.1 LTS "Trusty Tahr" - Release amd64 (20140722.2)
  PackageArchitecture: all
  ProcEnviron:
   LANGUAGE=en_GB:en
   PATH=(custom, no user)
   XDG_RUNTIME_DIR=<set>
   LANG=en_GB.UTF-8
   SHELL=/bin/bash
  SourcePackage: alsa-driver
  Symptom: audio
  Symptom_AlsaPlaybackTest: ALSA playback test through plughw:HDMI failed
  Symptom_Card: Built-in Audio - HDA Intel HDMI
  Symptom_Jack: Digital Out, HDMI
  Symptom_Type: None of the above
  Title: [XPS13 9333, Intel Haswell HDMI, Digital Out, HDMI] Playback problem
  UpgradeStatus: Upgraded to utopic on 2014-12-11 (3 days ago)
  dmi.bios.date: 09/11/2014
  dmi.bios.vendor: Dell Inc.
  dmi.bios.version: A05
  dmi.board.name: 0D13CR
  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.:bvrA05:bd09/11/2014:svnDellInc.:pnXPS139333:pvr:rvnDellInc.:rn0D13CR:rvrA00:cvnDellInc.:ct8:cvr0.1:
  dmi.product.name: XPS13 9333
  dmi.sys.vendor: Dell Inc.

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