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.

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https://bugs.launchpad.net/bugs/1709163

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

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