This simple tutorial shows how to increase or decrease the touchpad 2-finger scrolling speed in Ubuntu 22.04, Ubuntu 22.10, Ubuntu 23.04 with default GNOME on Wayland session.

GNOME, the default desktop for Ubuntu, Fedora, and optional in many other Linux, so far lacks option to configure the mouse/touchpad scroll speed.

For Ubuntu 20.04, Ubuntu 18.04, and other Linux with GNOME on classic Xorg, there’s a command line tool imwheel available to do the job. And, here’s a step by step guide show you how.

For Ubuntu 22.04 and higher and other Linux with GNOME Wayland, this tutorial may help by settings virtual touchpad size.

Step 1: Measure & Set virtual touchpad size

1. First, open terminal either by pressing Ctrl+Alt+T on keyboard, or by searching from ‘Activities’ overview screen.

2. When terminal opens, run command to install ‘libinput-tools’ package in case you don’t have it:

sudo apt install libinput-tools

3. Next, run command to tell your touchpad size (width and height in mm):

sudo libinput measure touchpad-size 100x100

As the screenshot shows, may laptop has touchpad with 114.6 mm width and 48.4 mm height. Once you got the value, press Ctrl+C to exit.

4. Finally, re-run the command in step 3, but with different args. For example, use 172×73 for 1.5x scroll speed (Here 172 ≈ 114.6 x 1.5, and 73 ≈ 48.4 x 1.5), run command:

sudo libinput measure touchpad-size 172x73

Or use 92×39 for 0.8x scroll-speed (92 ≈ 114.6 x 0.8, 39 ≈ 48.4 x 0.8):

sudo libinput measure touchpad-size 92x39

NOTE: You have to change the “width x height” number in command. Depends on your need to either increase or decrease scroll-speed, calculate them according the riginal size of your touchpad!!

Once you hit run the command, follow the terminal output to “Move one finger along all edges of the touchpad until the detected axis range stops changing.“  You’ll see the little ‘0’ in the terminal output moves correspondingly when you moving finger on touchpad.

5. When done, press Ctrl+C to stop it. And, you should get similar output as the screenshot shows, if you’ve done correctly.

And, you need to copy the lines between the 2 “-8<————–” lines (the section with white background).

Step 2: Apply Changes

1. Now, open terminal (Ctrl+Alt+T) and run command to edit the config file:

sudo gedit /etc/udev/hwdb.d/61-evdev-local.hwdb

Replace gedit in command with gnome-text-editor for Ubuntu 22.10+ and Fedora, or use nano instead.

When file opens, paste the lines you just copied in ‘Step 1’ and save it.

2. Finally, update hardware database by running command:

sudo systemd-hwdb update

And, reload udev rules by running command:

sudo udevadm trigger /dev/input/event*

When everything’s done. Restart your computer to see the effect!

As the steps above also increase or decrease the cursor movement speed, you may also need to open “Settings -> Mouse & Touchpad” and adjust ‘Touchpad Speed’ slider-bar.

How to Restore

To undo the changes you made via the previous steps, first open terminal (Ctrl+Alt+T) and run command to delete the config file:

sudo rm /etc/udev/hwdb.d/61-evdev-local.hwdb

Then update database and reload udev rules by running 2 commands one by one:

sudo systemd-hwdb update

sudo udevadm trigger /dev/input/event*

Finally, restart your computer and done.

via: reddit thread.