Comment 1 for bug 1867330

I think that I am having the same or a similar issue. When I plug in a headset, some sound comes out of the headset, but other sounds come out of the internal speakers. I think that the reason for this mix instead of the behavior that the bug reporter is observing is that at some point I installed pavucontrol and set the sound of some things to go to the headset, but as new sound sources come up they seem to go to the internal speaker (e.g., I recently had a very curious issue where the phone ringing sound from skype came through the headset, but the voice once someone answered was coming through the internal speaker). I can use pavucontrol to change this behavior, but it is annoying and unpredictable. Sound sources should be universally controllable by gnome volume settings.

Abraham Alvarez - I would suggest installing pavucontrol and seeing if you can change the sound output source manually with that. If that "fixes" your issue then you likely having the same problem as me.