If the problem was localized to 17.10 then I would have said try undoing
a recent change we introduced to /etc/pulse/default.pa:

### Use hot-plugged devices like Bluetooth or USB automatically (LP: #1702794)
.ifexists module-switch-on-connect.so
load-module module-switch-on-connect
.endif

But that's probably not relevant if you had the same bug in previous
Ubuntu versions.

There is however this module that's been enabled for a long time and
isn't documented so I'm not yet familiar with its behaviour. Perhaps
commenting this one out would help:

### Should be after module-*-restore but before module-*-detect
load-module module-switch-on-port-available

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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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