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Disabling mouse acceleration

Install the xorg-xinput package, providing the commandline tool xinput to configure devices .

Using Xorg, libinput sets itself as the default driver with /usr/share/X11/xorg.conf.d/40-libinput.conf. To activate the flat profile for our pointer device, we need to set the flat profile to 1 and the adaptive and custom profile options to 0.

Find out your device id:

# xinput

The first number indicates the default acceleration profile, the second number indicates the flat profile (No Acceleration), and the third number indicates a custom profile. To activate the flat profile:

# xinput set-prop "deviceid" "libinput Accel Profile Enabled" 0 1 0

Confirm the changes:

# xinput list-props "deviceid"

Make it persistent by adding the option to the pointer section:

Section "InputClass"
  Identifier "libinput pointer catchall"
  MatchIsPointer "on"
  MatchDevicePath "/dev/input/event*"
  Driver "libinput"
  Option "AccelProfile" "flat"
 EndSection
/etc/X11/xorg.conf.d/40-libinput.conf

Disable mouse acceleration in GDM

Disable mouse acceleration in GDM with Wayland:

[gdm]$ dbus-launch gsettings set org.gnome.desktop.peripherals.mouse accel-profile 'flat'

Configuring mouse acceleration

Setting the mouse acceleration depends on the windowing protocol you are using: either Xorg or Wayland.

Mouse acceleration with libinput

When using the adaptive pointer acceleration profile, libinput calculates the mouse acceleration depending on the DPI and the parameter Acceleration Speed https://wayland.freedesktop.org/libinput/doc/latest/pointer-acceleration.html. libinput relies on the resolution reported by evdev https://wayland.freedesktop.org/libinput/doc/latest/normalization-of-relative-motion.html. Feedback settings set with xset m are effectively ignored. When using the flat pointer acceleration profile, the acceleration factor is constant regardless of the velocity of the pointer. This provides 1:1 movement between the device and the pointer on-screen.

Changing the acceleration

Find the id of your device with xinput list and set the acceleration speed with the following command. Note that the acceleration speed has to be in the range of [-1,1]. Check this plot to see the impact of different acceleration speed values.

$ xinput --set-prop <device id> 'libinput Accel Speed' <acceleration factor>

Confirm your changes with the following:

$ xinput --list-props <device id>

Persistent configuration

libinput does not store configuration options, it is up to the caller to manage these. Under Wayland configuration is restored by the desktop environment. Under X xf86-input-libinput reads the xorg configuration files and applies the options https://wayland.freedesktop.org/libinput/doc/latest/faqs.html#how-do-i-configure-my-device-on-x. To make changes persistent under X create a file like this:

Section "InputClass"
  Identifier "<something to identify this snippet>"
  MatchDriver "libinput"
  MatchProduct "<substring of the device name>"
  Option "AccelSpeed" "<e.g. 0.3>"
EndSection
/etc/X11/xorg.conf.d/99-libinput-custom-config.conf

For further options see libinput(4).

Setting mouse acceleration

In Xorg configuration

See xorg.conf(5) for details.

Examples:

Section "InputClass"
	Identifier "My Mouse"
	MatchIsPointer "yes"
# set the following to 1 1 0 respectively to disable acceleration.
	Option "AccelerationNumerator" "2"
	Option "AccelerationDenominator" "1"
	Option "AccelerationThreshold" "4"
EndSection
/etc/X11/xorg.conf.d/50-mouse-acceleration.conf
Section "InputClass"
	Identifier "My Mouse"
	MatchIsPointer "yes"
# some curved deceleration
#	Option "AdaptiveDeceleration" "2"
# linear deceleration (mouse speed reduction)
	Option "ConstantDeceleration" "2"
EndSection
/etc/X11/xorg.conf.d/50-mouse-deceleration.conf

You can also assign settings to specific hardware by using "MatchProduct", "MatchVendor" and other matches inside class sections. Run lsusb to find out the product name and vendor to match:

$ lsusb -v | grep -e idProduct -e idVendor

If you are unable to identify your device, try running xinput list. Some devices the use Logitech Unifying Receiver share the same USB connection therefore, the mouse do not appear using lsusb

Using xinput

First, get a list of devices plugged in (ignore any virtual pointers):

$ xinput list

Take note of the ID. You may also use the full name in commands if the ID is prone to changing.

Get a list of available properties and their current values available for modification with

$ xinput list-props 9

where 9 is the ID of the device you wish to use. Or

$ xinput list-props "mouse name"

where mouse name is the name of your mouse given by xinput list.

Example, changing the property of Constant Deceleration to 2:

Device &#39;mouse name&#39;:
       Device Enabled (121):   1
       Device Accel Profile (240):     0
       Device Accel Constant Deceleration (241):       1.000000
       Device Accel Adaptive Deceleration (243):       1.000000
       Device Accel Velocity Scaling (244):    10.000000
$ xinput list-props 9
$ xinput --set-prop "mouse name" "Device Accel Constant Deceleration" 2

To make it permanent, edit Xorg configuration (see above) or add commands to xprofile. The latter will not affect speed in a display manager.

Configuration example

You may need to resort to using more than one method to achieve your desired mouse settings. Example to configure a generic optical mouse: First, slow down the default movement speed 3 times so that it is more precise.

$ xinput --set-prop 9 'Device Accel Constant Deceleration' 3

Then, enable acceleration and make it 3 times faster after moving past 6 units.

$ xset mouse 3 6

If you are satisfied with the results, store the preceding commands in ~/.xinitrc.