Backport from PulseAudio 9.0:
https://github.com/pulseaudio/pulseaudio/commit/23c15c3b52a958887c1f8cad3c94879a8770ef0e

** Patch added: 
"0102-switch-on-port-available-prefer-ports-that-have-been.patch"
   
https://bugs.launchpad.net/ubuntu/+source/pulseaudio/+bug/1641954/+attachment/4777722/+files/0102-switch-on-port-available-prefer-ports-that-have-been.patch

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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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