Some times I do the following: I connect my laptop to a screen with HDMI
cable and in the settings set audio output to the HDMI. Later I
disconnect the HDMI cable without doing anything to the sound settings
and turn off the PC. When I turn on the PC again it thinks that the
sound should still go to the HDMI, even though it's no longer connected.
Going in to the sound settings the Output Device drop-down is blank, so
it obviously knows that the HDMI is disconnected, but it just doesn't
make any sound.

That's the main issue I have. Not switching to HDMI sound on connecting
the HDMI might be the best default, I'm not sure, but at least you might
have some other preference for where you want your sound to come from
when you connect it. But when you disconnect, the sound can no longer
come from the HDMI, so you never want it to keep to the HDMI output, you
always want it to switch to something else.

----

My intuition about what should happen when you connect HDMI: If the
current output is trough built in speakers it should automatically
switch to HDMI. If the current output is trough mini-jack or other
output (meaning the person is using a headset or external speakers), it
should keep the current setting and not switch to HDMI.

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https://bugs.launchpad.net/bugs/1935770

Title:
  [Sound Output Built in Speaker to HDMI] No auto switch from Speaker to
  HDMI and back

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