I'm running Ubuntu 19.10 on a Dell Inspiron 13 7000 2-in-1 Black Edition (7391). The laptop comes with a really nice stylus, the Dell PN350M Active Pen, which unfortunately does not work under my system at all. A little bit of digging around the web reveals that the pen uses the Microsoft Pen Protocol to pair with a laptop instead of Bluetooth. Are these supported? Google leaves me with no answers.
EDIT:
Below is an updated output of xinput. There's something suspicious here, in particular the "UNKNOWN" thing.
~> xinput list
⎡ Virtual core pointer id=2 [master pointer (3)]
⎜ ↳ Virtual core XTEST pointer id=4 [slave pointer (2)]
⎜ ↳ DELL0960:00 04F3:30E4 Touchpad id=9 [slave pointer (2)]
⎜ ↳ CUST0000:00 27C6:0111 id=10 [slave pointer (2)]
⎜ ↳ CUST0000:00 27C6:0111 UNKNOWN id=11 [slave pointer (2)]
⎜ ↳ PS/2 Generic Mouse id=16 [slave pointer (2)]
⎜ ↳ M585/M590 Mouse id=18 [slave pointer (2)]
⎣ Virtual core keyboard id=3 [master keyboard (2)]
↳ Virtual core XTEST keyboard id=5 [slave keyboard (3)]
↳ Power Button id=7 [slave keyboard (3)]
↳ Video Bus id=6 [slave keyboard (3)]
↳ Dell WMI hotkeys id=14 [slave keyboard (3)]
↳ Intel HID 5 button array id=13 [slave keyboard (3)]
↳ Intel HID events id=12 [slave keyboard (3)]
↳ Integrated_Webcam_HD: Integrate id=8 [slave keyboard (3)]
↳ AT Translated Set 2 keyboard id=15 [slave keyboard (3)]
↳ M585/M590 Keyboard id=17 [slave keyboard (3)]