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Configuration for Logitech “Trackman” trackball

When Using X11

In /etc/share/X11/xorg.conf.d/10-trackball.conf, add the following for right-handed placement:

Section "InputClass"
	Identifier   "Marble Mouse"
	MatchProduct "Logitech USB Trackball"
	Driver       "libinput"
	Option       "ScrollMethod"    "button"
	Option       "ScrollButton"    "8"
	Option       "MiddleEmulation" "true"
EndSection

For left-handed placement:

Section "InputClass"
    Identifier      "Marble Mouse"
    MatchProduct    "Logitech USB Trackball"
    Driver          "libinput"
    Option          "ScrollMethod" "button"
    Option          "ScrollButton" "9"
    Option          "Middle Emulation" "on"
    Option          "ButtonMapping" "3 2 1 4 5 6 7 8 9"
EndSection

When Using Wayland and GNOME

gsettings set org.gnome.desktop.peripherals.trackball scroll-wheel-emulation-button <button_id>

Thanks to https://wiki.archlinux.org/index.php/Logitech_Marble_Mouse for the information.

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