/lib/udev/hwdb.d/70-touchpad.hwdb is in udev 237-3ubuntu10.
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 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 | # This file is part of systemd.
#
# Database for touchpad device information that cannot be queried directly.
#
# The lookup keys are composed in:
# 70-touchpad.rules
#
# Note: The format of the "touchpad:" prefix match key is a
# contract between the rules file and the hardware data, it might
# change in later revisions to support more or better matches, it
# is not necessarily expected to be a stable ABI.
#
# Match string format:
# touchpad:<subsystem>:v<vid>p<pid>:name:<name>:
#
# vid/pid as 4-digit hex lowercase vendor/product
#
# To add local entries, create a new file
# /etc/udev/hwdb.d/71-touchpad-local.hwdb
# and add your rules there. To load the new rules execute (as root):
# systemd-hwdb update
# udevadm trigger /dev/input/eventXX
# where /dev/input/eventXX is the touchpad in question. If in
# doubt, simply use /dev/input/event* to reload all input rules.
#
# If your changes are generally applicable, preferably send them as a pull
# request to
# https://github.com/systemd/systemd
# or create a bug report on https://github.com/systemd/systemd/issues and
# include your new rules, a description of the device, and the output of
# udevadm info /dev/input/eventXX.
#
# Permitted keys:
# Specify if a touchpad is a built-in one or external:
# ID_INPUT_TOUCHPAD_INTEGRATION=internal|external
touchpad:i8042:*
touchpad:rmi:*
touchpad:usb:*
ID_INPUT_TOUCHPAD_INTEGRATION=internal
touchpad:bluetooth:*
ID_INPUT_TOUCHPAD_INTEGRATION=external
###########################################################
# Wacom
###########################################################
touchpad:usb:v056a*
ID_INPUT_TOUCHPAD_INTEGRATION=external
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