I have noticed this also. After testing it seems to be a race condition.
I can only reproduce it when headphones are unplugged (not plugged in).
Essentially what is happening is that the headphone port becomes
unavailable therefore the backend goes to remove that output which
results in the UI moving to the next available port. Meanwhile the
speaker port becomes available but at that stage the damage is done as
the UI thinks the other device should be default. One potential solution
would be for the backend to always guarantee that the port which has
just become available to always send it's signal first ahead of the
signal which will remove the unavailable port.


** Changed in: gnome-control-center (Ubuntu)
       Status: New => Triaged

** Changed in: gnome-control-center (Ubuntu)
   Importance: Undecided => Low

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https://bugs.launchpad.net/bugs/989893

Title:
  [soundnua] Audio doesn't correctly switch when headphones are plugged
  in/unplugged

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