I'm running Ubuntu 20.04 on a Dell Inspiron 15 7591 2-in-1. The laptop comes with a stylus, the Dell PN350M Active Pen, which unfortunately does not work properly under my system. I found out that the pen uses Microsoft Pen Protocol to pair with my device. Below are some of the outputs that might help with solving this issue.
I found out that sudo evtest shows the pressure readings perfectly however, xinput --test doesn't show the pressure readings at all and the tip is considered as Button 1.
sudo evtest
[sudo] password for parth:
No device specified, trying to scan all of /dev/input/event*
Available devices:
/dev/input/event0: Lid Switch
/dev/input/event1: Power Button
/dev/input/event2: Sleep Button
/dev/input/event3: AT Translated Set 2 keyboard
/dev/input/event4: Integrated_Webcam_HD: Integrate
/dev/input/event5: DELL0908:00 04F3:30E3 Mouse
/dev/input/event6: Dell WMI hotkeys
/dev/input/event7: Intel HID events
/dev/input/event8: Intel HID 5 button array
/dev/input/event9: PS/2 Generic Mouse
/dev/input/event10: 2.4G Mouse
/dev/input/event11: 2.4G Mouse
/dev/input/event12: DELL0908:00 04F3:30E3 Touchpad
/dev/input/event13: Video Bus
/dev/input/event14: Video Bus
/dev/input/event15: CUST0000:00 27C6:0118
/dev/input/event16: CUST0000:00 27C6:0118 Stylus
/dev/input/event17: CUST0000:00 27C6:0118 UNKNOWN
/dev/input/event18: sof-hda-dsp Headphone Mic
/dev/input/event19: sof-hda-dsp HDMI/DP,pcm=3
/dev/input/event20: sof-hda-dsp HDMI/DP,pcm=4
/dev/input/event21: sof-hda-dsp HDMI/DP,pcm=5
Select the device event number [0-21]: 16
Input driver version is 1.0.1
Input device ID: bus 0x18 vendor 0x27c6 product 0x118 version 0x100
Input device name: "CUST0000:00 27C6:0118 Stylus"
Supported events:
Event type 0 (EV_SYN)
Event type 1 (EV_KEY)
Event type 3 (EV_ABS)
Event code 47 (ABS_MT_SLOT)
Value 0
Min 0
Max 9
Event code 53 (ABS_MT_POSITION_X)
Value 0
Min 0
Max 5760
Resolution 17
Event code 54 (ABS_MT_POSITION_Y)
Value 0
Min 0
Max 3240
Resolution 17
Event code 57 (ABS_MT_TRACKING_ID)
Value 0
Min 0
Max 65535
Event code 58 (ABS_MT_PRESSURE)
Value 0
Min 0
Max 1023
Event code 59 (ABS_MT_DISTANCE)
Value 0
Min 0
Max 1
Properties:
Property type 1 (INPUT_PROP_DIRECT)
Testing ... (interrupt to exit)
Event: time 1599396868.187587, type 3 (EV_ABS), code 57 (ABS_MT_TRACKING_ID), value 43
Event: time 1599396868.187587, type 3 (EV_ABS), code 53 (ABS_MT_POSITION_X), value 3767
Event: time 1599396868.187587, type 3 (EV_ABS), code 54 (ABS_MT_POSITION_Y), value 1597
Event: time 1599396868.187587, -------------- SYN_REPORT ------------
Event: time 1599396868.189591, type 3 (EV_ABS), code 59 (ABS_MT_DISTANCE), value 0
Event: time 1599396868.189591, type 3 (EV_ABS), code 58 (ABS_MT_PRESSURE), value 11
Event: time 1599396868.189591, -------------- SYN_REPORT ------------
xinput --test 15
motion a[0]=44467 a[1]=32959
button press 1 a[0]=44467 a[1]=32959
motion a[0]=44467 a[1]=32939
motion a[0]=44490 a[1]=32919
motion a[0]=44501 a[1]=32878
motion a[0]=44524 a[1]=32858
motion a[0]=44546 a[1]=32818
motion a[0]=44592 a[1]=32757
motion a[0]=44626 a[1]=32716
motion a[0]=44672 a[1]=32676
motion a[0]=44717 a[1]=32656
motion a[0]=44774 a[1]=32615
motion a[0]=44831 a[1]=32595
motion a[0]=44888 a[1]=32575
motion a[0]=44956 a[1]=32575
motion a[0]=45013 a[1]=32575
motion a[0]=45070 a[1]=32575
motion a[0]=45127 a[1]=32555
motion a[0]=45195 a[1]=32555
motion a[0]=45252 a[1]=32534
motion a[0]=45309 a[1]=32514
motion a[0]=45366 a[1]=32494
motion a[0]=45422 a[1]=32454
motion a[0]=45491 a[1]=32433
motion a[0]=45548 a[1]=32413
motion a[0]=45616 a[1]=32393
motion a[0]=45695 a[1]=32373
motion a[0]=45775 a[1]=32332
motion a[0]=45832 a[1]=32312
motion a[0]=45877 a[1]=32292
motion a[0]=45912 a[1]=32292
motion a[0]=45934 a[1]=32272
motion a[0]=45934 a[1]=32251
motion a[0]=45946 a[1]=32231
motion a[0]=45946 a[1]=32211
motion a[0]=45946 a[1]=32191
motion a[0]=45957 a[1]=32150
motion a[0]=45957 a[1]=32110
motion a[0]=45968 a[1]=32049
motion a[0]=45980 a[1]=32009
motion a[0]=45991 a[1]=31928
motion a[0]=46048 a[1]=31665
motion a[0]=46037 a[1]=31705
motion a[0]=46105 a[1]=31422
motion a[0]=46094 a[1]=31443
motion a[0]=46105 a[1]=31402
motion a[0]=46116 a[1]=31341
motion a[0]=46116 a[1]=31341
button release 1 a[0]=46116 a[1]=31341
Any help would be appreciated!