In short (while someone already waiting for me), please try the following combo with your Librem 5 (only 5V/2.4A or only 5V/3A power supplies should, as I’m expecting, charge Librem 5 connected to the compliant docking station up to more than enough/adequate 5V/1.5A 
, while no other voltage negotiated, as only 5V present):
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