Unable to Launch XP-Pen Drawing Tablet Driver with Qt Wayland Plugin Error

[loafylemon]

I'm having trouble running the XP-Pen drawing tablet driver on my system while using COSMIC. Despite installing the qtwayland5 and qt6-wayland packages (I don't know what version of QT they used, or how to check it), the driver fails to launch correctly. The driver is listed as compatible with Pop!_OS on its download page, which is why I chose this tablet in the first place. It would be great to get it working under COSMIC sooner or later. I should emphasize that the driver works fine under GNOME.

System Information:

• XP-Pen Driver Version: XPPenLinux3.4.9-240131
• Qt Version: Unknown
• Session: Wayland
• GPU: Nvidia RTX 3070m
• CPU: AMD 5900HX

Bug Description:

loafy@pop-os:~$ /usr/lib/pentablet/PenTablet.sh
This application failed to start because it could not find or load the Qt platform plugin "wayland;xcb"
in "".

Available platform plugins are: xcb.

Reinstalling the application may fix this problem.
Aborted (core dumped)

Steps to Reproduce:

• Install the XP-Pen drawing tablet driver. (No actual tablet needed)
• Attempt to launch the driver using the desktop entry or /usr/lib/pentablet/PenTablet.sh.

Workaround:

1. When launching the driver with QT_QPA_PLATFORM=xcb env var, it launches, but the interface is broken. For example, drop-down menus do not work properly.