XP-Pen Star G640 (28bd:0914) incorrectly detected as Eraser on Wayland

[Mykyta]

Hello,

I am reporting a hardware misidentification issue with the XP-Pen Star G640 (reported by the system as "Hanvon ugee 6 inch PenTablet Pen"). On Ubuntu running Wayland, the device is permanently stuck in eraser mode.

Evidence:

    Hardware ID: 28bd:0914

    Detection Issue: As shown in the attached libinput debug-tablet output, the system identifies the tool as Tool: eraser serial 0, id 0 even when using the standard pen tip.

    Missing Capabilities: libinput list-devices shows Capabilities: tablet but lacks the necessary stylus sub-attributes for pressure and correct tool mapping.

Environment:

    OS: Ubuntu

    Session: Wayland

    Driver: hid-uclogic (kernel) / libinput (compositor)

Because I am on Wayland, standard X11 tools like xsetwacom are unavailable to remap this behavior. I am requesting a proper hardware quirk or libwacom update to correctly identify this stylus.

ProblemType: Bug
DistroRelease: Ubuntu 25.10
Package: linux-image-6.17.0-8-generic 6.17.0-8.8
ProcVersionSignature: Ubuntu 6.17.0-8.8-generic 6.17.2
Uname: Linux 6.17.0-8-generic x86_64
ApportVersion: 2.33.1-0ubuntu3
Architecture: amd64
CasperMD5CheckResult: pass
CurrentDesktop: ubuntu:GNOME
Date: Fri Jan 9 22:32:09 2026
HibernationDevice: RESUME=/dev/nvme0n1p4
InstallationDate: Installed on 2025-10-04 (97 days ago)
InstallationMedia: Ubuntu 25.04 "Plucky Puffin" - Release amd64 (20250415.3)
MachineType: LENOVO 20W1S22T26
ProcFB: 0 i915drmfb
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-6.17.0-8-generic root=UUID=32e81498-5fd5-4d39-8809-6de2cd420660 ro quiet splash i915.force_probe=* i915.modeset=1 resume=/dev/nvme0n1p4 mem_sleep_default=deep crashkernel=2G-4G:320M,4G-32G:512M,32G-64G:1024M,64G-128G:2048M,128G-:4096M vt.handoff=7
PulseList: Error: command ['pacmd', 'list'] failed with exit code 1: No PulseAudio daemon running, or not running as session daemon.
RelatedPackageVersions:
 firmware-sof N/A
 linux-firmware 20250901.git993ff19b-0ubuntu1.5
SourcePackage: linux
UpgradeStatus: Upgraded to questing on 2025-11-15 (55 days ago)
dmi.bios.date: 10/30/2024
dmi.bios.release: 1.64
dmi.bios.vendor: LENOVO
dmi.bios.version: N34ET64W (1.64 )
dmi.board.asset.tag: Not Available
dmi.board.name: 20W1S22T26
dmi.board.vendor: LENOVO
dmi.board.version: SDK0J40697 WIN
dmi.chassis.asset.tag: No Asset Information
dmi.chassis.type: 10
dmi.chassis.vendor: LENOVO
dmi.chassis.version: None
dmi.ec.firmware.release: 1.45
dmi.modalias: dmi:bvnLENOVO:bvrN34ET64W(1.64):bd10/30/2024:br1.64:efr1.45:svnLENOVO:pn20W1S22T26:pvrThinkPadT14Gen2i:rvnLENOVO:rn20W1S22T26:rvrSDK0J40697WIN:cvnLENOVO:ct10:cvrNone:skuLENOVO_MT_20W1_BU_Think_FM_ThinkPadT14Gen2i:
dmi.product.family: ThinkPad T14 Gen 2i
dmi.product.name: 20W1S22T26
dmi.product.sku: LENOVO_MT_20W1_BU_Think_FM_ThinkPad T14 Gen 2i
dmi.product.version: ThinkPad T14 Gen 2i
dmi.sys.vendor: LENOVO

[Ian Whitfield (ijwhitfield)]

Hi, thanks for opening a bug report!

It's likely that this issue is present upstream as well, I don't see any existing fixups for this device in the mainline tree. You could verify that by trying one of our mainline kernel builds, the latest is https://kernel.ubuntu.com/mainline/v6.19-rc5/ and instructions are available at https://wiki.ubuntu.com/Kernel/MainlineBuilds

If the stylus isn't properly configured on mainline either, you may want to directly report the issue to the hid-uclogic driver maintainers, since we don't maintain this driver and wouldn't have the appropriate hardware to debug and test a fix.

For the sake of just getting the device up and running, though, have you already tried installing the first party drivers from XP-Pen? I see they have .deb packages here: https://www.xp-pen.com/download/star-g640.html