The problem existed even before I upgraded to 17.10. but now I can not
go back to that version.

I think it started to happen when upgrading the kernel version. I
thought that it would eventually be fixed but apparently I'm about the
only one seeing this.

What I do not understand is why it changes as the selected output is
present all the time, and especially when I turn off a screen that has
no audio associated with it. The monitor has no speakers.

the only  think I can think of is that the display subsystem is doing
some reinit when I turn off the monitor and might remove the HDMI audio
associated with the other monitor that still is on and then reinserting
it. But why do pulse audio then switch over to that ?? is this some auto
thing like if I put in headphones.

the old GUI(unity) I could directly select sound config from the top
icons. but now I have to first go to setting then sound so its even more
work than before to get sound back.

You received this bug notification because you are a member of Desktop
Packages, which is subscribed to pulseaudio in Ubuntu.

  default output changes from intel builtin to hdmi when display is
  turned off. yes off not on

Status in pulseaudio package in Ubuntu:

Bug description:
  So if I have sound output selected to be the intel sound on the
  mainboard and turn off one of my two displays the audio out is changed
  to HDMI. YES OFF it's not a typo.

  The Display I turn off is connected to displayport and do not even
  have HDMI. The audio is switched over to the still active display.

  If I then turn the display back it's still hdmi. If I then turn off
  the display that has HDMI out connected. the audio is still connected
  to that display. since its actually off I hear no sound but pulseaudio
  still connect to it.

  I have to manually open the GUI tool and change back to the correct
  output when the display is turned off or when the display is blanked.
  or suspend/resume.

  I attache the output of "pacmd list-cards  && pacmd list-sinks"
  ok   -> ps_w1.txt
  fail -> ps_f1.txt
  ApportVersion: 2.20.6-0ubuntu4
  Architecture: amd64
   /dev/snd/controlC0:  kenjo      3721 F.... pulseaudio
   /dev/snd/controlC1:  kenjo      3721 F.... pulseaudio
  CurrentDesktop: GNOME
  DistroRelease: Ubuntu 17.10
  InstallationDate: Installed on 2015-10-18 (659 days ago)
  InstallationMedia: Ubuntu 15.10 "Wily Werewolf" - Alpha amd64 (20150924)
  Package: pulseaudio 1:10.0-2ubuntu1
  PackageArchitecture: amd64
  Tags:  artful
  Uname: Linux 4.12.1-041201-generic x86_64
  UpgradeStatus: Upgraded to artful on 2017-06-10 (59 days ago)
  UserGroups: adm cdrom dip libvirt libvirtd lpadmin lxd plugdev sambashare 
sudo video wireshark
  _MarkForUpload: True 04/25/2017
  dmi.bios.vendor: American Megatrends Inc.
  dmi.bios.version: 1.I0
  dmi.board.asset.tag: Default string Z170A GAMING M7 (MS-7976)
  dmi.board.vendor: MSI
  dmi.board.version: 1.0
  dmi.chassis.asset.tag: Default string
  dmi.chassis.type: 3
  dmi.chassis.vendor: MSI
  dmi.chassis.version: 1.0
dmi:bvnAmericanMegatrendsInc.:bvr1.I0:bd04/25/2017:svnMSI:pnMS-7976:pvr1.0:rvnMSI:rnZ170AGAMINGM7(MS-7976):rvr1.0:cvnMSI:ct3:cvr1.0: Default string MS-7976
  dmi.product.version: 1.0
  dmi.sys.vendor: MSI
  modified.conffile..etc.pulse.daemon.conf: [modified]
  mtime.conffile..etc.pulse.daemon.conf: 2016-04-23T00:00:29.066742

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