5

I am running a Thinkpad T470. I often dock this, meaning I have 3 mouse input devices (external Microsoft mouse, Trackpoint, and Trackpad). I'm running Debian 10 (Testing - Buster) using Gnome under Wayland.

In Gnome settings (below) I can change the sensitivity of the "Mouse" by configuring "Mouse Sensitivity". However, this changes the sensitivity of both the external mouse and the trackpoint. I like to have my trackpoint on low sensitivity, and the mouse on high.

Gnome Mouse Settings

Under Xorg, I could make a simple script to set device specific configuration settings. How would I achieve this in Wayland?

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I did it on an x230 with Debian 10 by writing this file to '/etc/udev/hwdb.d/71-pointingstick-local.hwdb':

# /etc/udev/hwdb.d/71-pointingstick-local.hwdb
#
# This file contains a custom "hwdb" entry to set pointing stick speed for
# Wayland by "normalizing" device dpi. (for details see:
# https://wayland.freedesktop.org/libinput/doc/latest/normalization-of-relative-motion.html).
# 
# My purpose is to set touchpoint speed seperate from external mouse so I don't have
# to change it by hand every time I plug in a mouse. The touchpoint got un-useably 
# over sensitive with the last update. This worked on Debian 10, might also 
# work on Ubuntu or other derivates, circa ~2019. Good luck until they change it again :/
#
# copy the stanza for your device from /usr/lib/udev/hwdb.d/70-pointingstick.hwdb
# into this file.
#
# per https://cgit.freedesktop.org/systemd/systemd/tree/hwdb/70-mouse.hwdb
# edit sensitivity, then run:
# sudo udevadm hwdb --update
# sudo udevadm trigger /dev/input/event6 #(with your device number)
# 
# input device can be discovered with:
# sudo libinput list-devices | grep -A 20 TrackPoint

# Lenovo Thinkpad X230
evdev:name:TPPS/2 IBM TrackPoint:dmi:bvn*:bvr*:bd*:svnLENOVO:pn*:pvrThinkPadX230:*
#POINTINGSTICK_SENSITIVITY=400 # Too fast!
 POINTINGSTICK_SENSITIVITY=100 # better...
 POINTINGSTICK_CONST_ACCEL=1.0
7

Wayland expects all mice motion to have been normalised, so there is only one global changeable configuration. You may have to edit your hwdb entry for one of your devices to correct it if it is wrong, or just make it fit in with your preferences.

Alternatively, you may be able to use libevdev-tweak-device from the package libevdev-tools (or libevdev-utils). It says it can alter the definition of an evdev device dynamically. You would do something like

sudo libevdev-tweak-device --abs ABS_X --res 99 /dev/input/event99
sudo libevdev-tweak-device --abs ABS_Y --res 99 /dev/input/event99

where you need to replace the 99 by the resolution you want, and event99 by the input device. You can find the input device from, eg:

$ ls -l /dev/input/by-id/
lrwxrwxrwx ... usb-Logitech_USB_Optical_Mouse-event-mouse -> ../event5

To find the current resolution try sudo evemu-describe from the evemu-tools package, or use mouse-dpi-tool to try to choose a good value.

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