Audio control does not recognize it is disconnected from HDMI
I hope this issue is right here, if not maybe in gnome-control-center it would be better placed.
- Your internal laptop audio is turned off. Mute.
- You have HDMI and connect that to some device that can output audio.
- You switch to that new audio in the audio settings (awkwardly that's also needed as it does not auto-select that, maybe let's track that on a new issue??). Screen automatically switches/adjusts (to dual screens)
- You plug-off the HDMI cable. Screen adjusts back.
The audio, however, stays as it is!
- If you adjust the volume (with keyboard), it shows you it is clearly (trying to) adjust the HDMI volume.
- In the settings itself however, it is not even shown anymore. And the internal audio is not selected.
Selecting the internal audio in the control center obviously "fixes" the issue as it changes the audio output, but this should not be necessary.
What should happen
Automatically select useful audio output if it is disconnected.
Fedora 29 GNOME 3.30
This is reproducible. This even survives a reboot.