/usr/share/libwacom/dtu-2231.tablet is in libwacom-common 0.18-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 | # Wacom
# DTU-2231 Interactive Pen Display
#
[Device]
Name=Wacom DTU-2231
DeviceMatch=usb:056a:00ce
Class=PenDisplay
Width=19
Height=11
IntegratedIn=Display
[Features]
Stylus=true
Buttons=0
|