[Bug 1834138] [NEW] PA: can't auto switch streams between different sinks

[Launchpad Bug Tracker]

You have been subscribed to a public bug by Hui Wang (hui.wang):

On the Lenovo P52 machine, there are dual analogue codecs: the 1st one
contains the speaker and front headphone, the 2nd one contains the rear
lineout.

As there are two codecs, there are 2 sinks in the PA, the one sink has
speaker and headphone, the other one has the lineout

Supposing users play music via totem (gnome app) and neither front
headphone nor rear lineout is plugged, the sound will comes out from
speaker. While the music is playing, if users plug a headphone into the
front headphone, the headphone will show up in the gonme-sound-setting
and the speaker will disappear, and the sound will change to heapdhone
from speaker, so the steam auto swtiches from speaker to headphone
because both speaker and headphone belong to the same PA sink. But while
the music is playing, if users plug a headphone into the rear lineout
jack, the lineout will show up in the gnome-sound-setting and the
speaker will disappear too, but the sound will not switch to lineout, it
keeps staying in the speaker even the UI shows the speaker is relaced by
lineout. it doesn't auto switch just because the speaker belongs to one
sink and the lineout belongs to the other.

When this issue happens, if users want the sound comes out from lineout,
users have to close the totem and re-run the toem to make the sound come
out from lineout. This is not user friendly.

And a similar situation is:
users play the music through lineout and UI (gnome-soudn-setting) shows lineout is active, while it is playing the music, if users unplug the headphone from the rear lineout jack, the lineout will disappear from UI and the speaker will show up, but the sound still comes from lineout, it doesn't switch to speaker.

** Affects: hwe-next
     Importance: Undecided
         Status: New

** Affects: pulseaudio (Ubuntu)
     Importance: High
     Assignee: Hui Wang (hui.wang)
         Status: Incomplete


** Tags: eoan originate-from-1833676 sutton
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PA: can't auto switch streams between different sinks
https://bugs.launchpad.net/bugs/1834138
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