On Wed, Nov 16, 2016 at 12:58:14AM AEDT, Cristian Klein wrote:
> (1) Alice listens to music on her speakers, which are connected to the
> screen, which is connected through HDMI to the computer.
> 
> (2) Alice leaves the computer, the screen gets suspended (DPMS off).
> 
> (3) PulseAudio sees that the HDMI output got disconnected (although only
> for a short interval) and switches to internal speaker.

Ok, with a fresh Xenial install, I don't seem to get this behavior. I
have tested with 2 different monitors, both different brands from each
other. I set the HDMI audio out as the output, start playing audio, and
let the screen turn off and/or run xset dpms force off. In either case,
audio stops playing, but does not switch to another device. When I press
a key and the screen turns back on, the music resumes playback on the
monitor's speakers.

I should note that I've also tested this on 3 different machines, 2 that
were also connected to speakers via 3.5mm analog jack, and another via
S/PDIF.

Am I missing something?

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Touch seeded packages, which is subscribed to pulseaudio in Ubuntu.
https://bugs.launchpad.net/bugs/1641954

Title:
  Output switches from HDMI speakers to internal speakers on DPMS off

Status in pulseaudio package in Ubuntu:
  New

Bug description:
  PulseAudio 8.0 includes a well-known user-experience regression: Its
  new auto-routing algorithm tries to switch to another output, as soon
  as the active output gets disconnected. This leads to the following
  bad user experience:

  (1) Alice listens to music on her speakers, which are connected to the
  screen, which is connected through HDMI to the computer.

  (2) Alice leaves the computer, the screen gets suspended (DPMS off).

  (3) PulseAudio sees that the HDMI output got disconnected (although
  only for a short interval) and switches to internal speaker.

  (4) Alice returns to the computer but finds that the music is now
  playing through the internal speakers.

  (5) Alice can switch the output to the HDMI speakers manually, but the
  above user experience bug will reoccur when she leaves the computer
  again.

  This is a well-known upstream bug that was fixed in PulseAudio 9.0.
  Due to the fact that Ubuntu 16.04.1 LTS uses PulseAudio 8.0, it is
  desirable to backport this fix to PulseAudio 8.0, so that all LTS
  users have better experience. Upstream said they would not do this and
  that I should report this to Ubuntu directly.

  Other information:
  * Upstream bug: https://bugs.freedesktop.org/show_bug.cgi?id=93946
  * Fix 1: 
https://cgit.freedesktop.org/pulseaudio/pulseaudio/commit/?id=04040c522f5f62dda50ac927e92453381d419f09
  * Fix 2: 
https://github.com/pulseaudio/pulseaudio/commit/23c15c3b52a958887c1f8cad3c94879a8770ef0e

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