Stylus pressure not working ThinkPad X1 Yoga 3G on Debian Buster

I recently got an ThinkPad X1 Yoga (3rd generation) with an integrated stylus. Debian Buster (10 RC1) is installed. I'm using the Cinnamon desktop environment. The stylus works nicely as a generic pointing device, but it seems the pressure sensitivity of the stylus is not detected. I enabled the stylus/eraser devices in Gimp to test. But in tutorials there sometimes seems to be a pressure device as well. There is no pressure device listed for me. In Xournal, if I set the program to recognize pressure, the text looks a bit different, but I am not sure if it is actually using the pressure sensitivity. What can be done to fix or at least further debug this problem?