can somebody tell me why I have to change in the “settings-audio-audio-audio hardware setup” from loudspeaker to analog headphones to use the outlet for audio jacks. Usually the outlet is doing it by itself mechanically?
Kind regards,

No that is usually a software switch in the driver that is changed using auto sense.
Open up your /etc/pulse/ file as root and make sure this line isn’t commented out:

load-module module-switch-on-port-available