Background
A Logitech TrackMan was configured to have its small right button trigger the back functionality in Firefox. Here's an image of the device from the Ubuntu Community wiki:
The keyboard and mouse are routed through an IOGEAR 2-Port KVM switch. The values from xinput show:
$ xinput list
⎡ Virtual core pointer id=2 [master pointer (3)]
⎜ ↳ Virtual core XTEST pointer id=4 [slave pointer (2)]
⎜ ↳ ATEN KVM V1.2.116 id=12 [slave pointer (2)]
⎣ Virtual core keyboard id=3 [master keyboard (2)]
↳ Virtual core XTEST keyboard id=5 [slave keyboard (3)]
↳ Video Bus id=7 [slave keyboard (3)]
↳ Power Button id=6 [slave keyboard (3)]
↳ Power Button id=8 [slave keyboard (3)]
↳ ATEN KVM V1.2.116 id=11 [slave keyboard (3)]
↳ Unicomp Inc Unicomp R7_2_10x_Kbrd_v7_47 id=13 [slave keyboard (3)]
↳ Asus WMI hotkeys id=9 [slave keyboard (3)]
↳ Eee PC WMI hotkeys id=10 [slave keyboard (3)]
System:
$ uname -a
Linux hostname 6.9.3-arch1-1 #1 SMP PREEMPT_DYNAMIC Fri, 31 May 2024 15:14:45 +0000 x86_64 GNU/Linux
$ cat /etc/issue
Antergos Linux \r (\l)
$ echo $XDG_SESSION_TYPE
x11
Using the KVM appears to hide the product name. So despite X11 having an input class set, I don't believe the configuration is being applied:
$ cat /etc/X11/xorg.conf.d/10-libinput.conf
Section "InputClass"
Identifier "Marble Mouse"
MatchProduct "Logitech USB Trackball"
Driver "libinput"
Option "ScrollMethod" "button"
Option "ScrollButton" "9"
Option "MiddleEmulation" "true"
Option "HorizontalScrolling" "false"
Option "ButtonMapping" "1 2 3 4 5 6 7 9 8"
EndSection
Instead, the buttons are remapped as follows:
$ cat $HOME/.xsessionrc
# Enable click+hold small right mouse button for scrolling trackball.
xinput set-prop 12 "libinput Button Scrolling Button" 9
# Disable horizontal trackball scrolling.
xinput set-prop 12 "libinput Horizontal Scroll Enabled" 0
# Forward small left click; backward small right click.
xinput set-button-map 12 1 2 3 4 5 6 7 9 8
Testing the right-click shows button #8:
$ xinput test 12
button press 8
button release 8
Note: The trackball is used left-handed, so buttons 8 and 9 are swapped.
In Firefox, the about:config settings for mousebutton.4th.enabled and mousebutton.5th.enabled are set to false, although this setting appears to have no effect.
Problem
This functionality no longer works. That is, clicking the small button no longer navigates back in the browser. Scrolling continues to work.
Question
Any idea how I can reinstate a single click for button 9 in the image as the back functionality for Firefox, while maintaining the ability to scroll by pressing and holding that same button?
