Hi, thanks for helping me out.

No, the HDMI was not plugged in -- nor ever has been.  I'm using a
laptop and the sound output should have been the built-in audio.  After
I upgraded the system, it once (and only once) wanted to run all the
output through the HDMI, resulting in no audio at all.  After running
the apport-bug on the audio, I have had no further problem though.

What do we need to do to get to the bottom of this?

(Just to be clear, I have sound now, despite having not changed
anything).

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You received this bug notification because you are a member of Desktop
Packages, which is subscribed to pulseaudio in Ubuntu.
https://bugs.launchpad.net/bugs/1253739

Title:
  [Inspiron 1525, Silicon Image SiI1392 HDMI, Digital Out, HDMI] No
  sound at all

Status in “pulseaudio” package in Ubuntu:
  New

Bug description:
  Initially, I had to reset the sound card manually from 'HDMI' to
  'analogue' to get sound working, but then the hotkeys no longer
  managed to control volume.  Now, having run the bug report, things
  work again!  I do not understand why.

  ProblemType: Bug
  DistroRelease: Ubuntu 13.10
  Package: pulseaudio 1:4.0-0ubuntu6
  ProcVersionSignature: Ubuntu 3.11.0-13.20-generic 3.11.6
  Uname: Linux 3.11.0-13-generic x86_64
  ApportVersion: 2.12.5-0ubuntu2.1
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC0:  bryn       1428 F.... pulseaudio
  Date: Thu Nov 21 18:16:01 2013
  InstallationDate: Installed on 2012-10-30 (387 days ago)
  InstallationMedia: Xubuntu 12.04 LTS "Precise Pangolin" - Release amd64 
(20120425)
  MarkForUpload: True
  SourcePackage: pulseaudio
  Symptom: audio
  Symptom_AlsaPlaybackTest: ALSA playback test through plughw:Intel successful
  Symptom_Card: Built-in Audio - HDA Intel
  Symptom_DevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC0:  bryn       1428 F.... pulseaudio
  Symptom_Jack: Digital Out, HDMI
  Symptom_PulsePlaybackTest: PulseAudio playback test failed
  Symptom_Type: No sound at all
  Title: [Inspiron 1525, Silicon Image SiI1392 HDMI, Digital Out, HDMI] No 
sound at all
  UpgradeStatus: Upgraded to saucy on 2013-11-16 (5 days ago)
  dmi.bios.date: 03/10/2008
  dmi.bios.vendor: Dell Inc.
  dmi.bios.version: A11
  dmi.board.name: 0U990C
  dmi.board.vendor: Dell Inc.
  dmi.chassis.type: 8
  dmi.chassis.vendor: Dell Inc.
  dmi.modalias: 
dmi:bvnDellInc.:bvrA11:bd03/10/2008:svnDellInc.:pnInspiron1525:pvr:rvnDellInc.:rn0U990C:rvr:cvnDellInc.:ct8:cvr:
  dmi.product.name: Inspiron 1525
  dmi.sys.vendor: Dell Inc.

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