Broken: both 2.79b and 2.8 build Hash:492dbae4d1a
Short description of error
Pressure sensitivity from Surface Pen simply doesn't register in Blender. Works in other apps like Sketchbook Pro and various Windows 10 Ink apps like Sketch, OneNote, Sticky notes
Exact steps for others to reproduce the error
Need Surface Laptop (but I believe it's the case with other Surface devices, based on other bugs reported here). No special steps required, doesn't work in texture paint, grease pencil, and sculpting.