Krita: Using built-in Lenovo C940 pen on Windows

What I expected When running Krita in Windows on a Lenovo C940 laptop I should be able to use the built-in pen to get pressure sensitivity. E.g. when using a pen which becomes larger the more you press. What I got The pressure sensitivity is non-functional but strange. On a normal document, when doing quick swipes with a pressure sensitive pen, there is a thin line and many large circles which appear haphazardly....