Unix & Linux Asked by Peter L on December 18, 2020
In Linux, how do I setup a Logitech Marble Mouse so that the would-be ‘back’ button is changed to a scroll modifier? IE: Hold the ‘back’ button down and now the track ball controls scroll.
I use the following config (similar to @PeterL, but does not disable the back button)
/etc/X11/xorg.conf.d/10-libinput.conf
Section "InputClass" Identifier "Marble Mouse" MatchProduct "Logitech USB Trackball" Driver "libinput" Option "ScrollMethod" "button" Option "ScrollButton" "8" Option "AccelSpeed" "1" # Option "TransformationMatrix" "2.4 0 0 0 2.4 0 0 0 1" EndSection
The commented TransformationMatrix allows to skip pixels and move faster, but I prefer to change the DPI as below instead.
# Logitech Marble Mouse #id obtained by: mouse-dpi-tool /dev/input/event4 mouse:usb:v046dpc408:name:Logitech USB Trackball: # keep space below MOUSE_DPI=100@125
and then udevadm hwdb --update
, udevadm control --reload-rules && udevadm trigger
and unplug, plug mouse.
The DPI of 100 may be too sensitive for some, you could replace by 200@125.
Answered by jherek on December 18, 2020
You can also use evdev
driver. To do so add following to a new /usr/share/X11/xorg.conf.d/50-marble-mouse.conf
Section "InputClass"
Identifier "Marble Mouse"
MatchProduct "Logitech USB Trackball"
MatchIsPointer "on"
MatchDevicePath "/dev/input/event*"
Driver "evdev"
Option "ButtonMapping" "1 2 3 4 5 6 7 8 9"
Option "EmulateWheel" "true"
Option "EmulateWheelButton" "8"
Option "ZAxisMapping" "4 5"
Option "XAxisMapping" "6 7"
Option "Emulate3Buttons" "true"
EndSection
Above configuration works for me on Ubuntu 18.04 but it does not on Xubuntu 18.04 running on a ThinkPad R60. For the latter I have to use the libinput
config posted above by Peter.
Answered by karlsebal on December 18, 2020
I'm using an Arch derivative (Antergos) and this config was derived from their Marble Mouse wiki page.
Add the following to the /usr/share/X11/xorg.conf.d/40-libinput.conf file...
# Section added for scroll with Marble Mouse
Section "InputClass"
Identifier "Marble Mouse"
MatchProduct "Logitech USB Trackball"
Driver "libinput"
Option "ButtonMapping" "1 2 3 4 5 6 7 0 9"
Option "ScrollMethod" "button"
Option "ScrollButton" "8"
Option "MiddleEmulation" "on"
EndSection
Note that the back button operation has been disabled because it would occasionally fire when trying to scroll.
Answered by Peter L on December 18, 2020
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