pavucontrol lists two ports: "Analog Output" (which gives sound on the headphone jack of the docking station as well as the internal speakers of the notebook) and "Analog Headphones" (which gives sound on the internal headphone jack of the notebook, no sound on the internal speakers or the headphone jack of the docking station, even if there is nothing plugged into the internal headphone jack of the notebook).
I can't select only the internal speakers or only the headphone jack of the docking station, either both output sound or neither do.
pavucontrol lists two ports: "Analog Output" (which gives sound on the headphone jack of the docking station as well as the internal speakers of the notebook) and "Analog Headphones" (which gives sound on the internal headphone jack of the notebook, no sound on the internal speakers or the headphone jack of the docking station, even if there is nothing plugged into the internal headphone jack of the notebook).
I can't select only the internal speakers or only the headphone jack of the docking station, either both output sound or neither do.