Comment 4 for bug 1639337

Note, this bug does not only apply to USB digitizers but to built-in digitizers in some 2-in-1's as well (I am experiencing exactly the same behavior on a fresh install of 16.10 but instead with the pen on my lenovo miix 700 tablet, 100% vanilla drivers from the ubuntu install).

The pressure events show up just fine when watching from evtest, but xinput never seems to get ABS_PRESSURE updates. xinput sees the device axis just never gets update, which pins the pressure at zero. This is not a bug at the driver level, It's almost definitely some kind of regression in xorg/xinput/touch code..

Since the pressure is stuck at zero, this bug doesn't just stop pressure sensing, it's a total creative showstopper - makes it impossible to draw in any of the various art programs because pressure=0 --> nothing gets drawn in most programs, Krita segfaults, etc. etc.