I could reproduce this problem with padme-3 machine.

But it looks like a hardware design limitation, plugging
headset/headphone into the audio jack, the speaker will be muted by
hardware signal (like a enable signal)?

I checked both pulseaudio and alsa driver, there is no obvious problem.

BTW, How does it work under windows?

** Changed in: pulseaudio (Ubuntu)
   Importance: Undecided => Critical

** Changed in: pulseaudio (Ubuntu)
     Assignee: (unassigned) => Hui Wang (hui.wang)

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https://bugs.launchpad.net/bugs/1896098

Title:
  Lenovo P1G3 - unable to select system speakers when headset plugged
  into audio jack

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