XP-Pen Deco 01 V2 buttons not recognized

[tockudex]

• Device name: XP-Pen Deco 01 V2

• Device model identifier: UGTABLET 10 inch PenTablet Pad

• libwacom version: 2.16.1

• I understand that libwacom does not affect whether the device works (see Troubleshooting)

Bug description

libwacom-list-local-devices returns 2 buttons for my tablet, whereas it should have 10 (2 for the pen and 8 for the tablet itself).

Looking at the unique /usr/share/libwacom/xp-pen-deco01-v2.tablet file does show 8 buttons on the left (A to H).

When I press a tablet's button, the light indicates the keypress has been registered, but they do not appear in when debugging with sudo libinput debug-events.

Additionally, the buttons remapping options in the KDE Plasma system settings does not appear (the tablet "Display" and "Pen" tabs are available).

The issue might be related to libinput, but being uncertain, I preferred to start here.

[whot]

The XP Pen tablets only work if the uclogic kernel driver supports them or, alternatively, there is a BPF driver in udev-hid-bpf. The latter is the recommended solution for newer device support.

Without that support the various GUI configurations and libinput to some degree won't work correctly.

libwacom-list-local-devices returns 2 buttons for my tablet

can you post the output here please.

[tockudex]

I look into udev-dih-bpf. Just installing it, doesn't fix the issue.

libwacom-list-local-devices

devices:
  - name: 'UGTABLET 10 inch PenTablet Pad'
    bus: 'usb'
    vid: 0x28bd
    pid: 0x0905
    nodes: 
      - /dev/input/event19: 'UGTABLET 10 inch PenTablet'
      - /dev/input/event18: 'UGTABLET 10 inch PenTablet'
      - /dev/input/event17: 'UGTABLET 10 inch PenTablet'
    styli:
      - id: 0xffffd
        vid: 0x0000
        name: 'General Pen with no Eraser'
        type: 'general'
        axes: ['x', 'y' , 'pressure']
        buttons: 2
        erasers: []

[whot]

There's this MR in udev-hid-bpf that added the Deco 02, chances are the Deco 01 isn't that different and could be adjusted. I can't find the 0x905 VID in udev-hid-bpf which means it's just not supported yet.

    buttons: 2

that line refers to the buttons on the pen. The .tablet file for this lists 8 buttons, so in theory that should be correct then.