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How to disable a specific mouse button with udev rules
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61-evdev-local.hwdb
evdev:name:Kingsis Peripherals Evoluent VerticalMouse*
KEYBOARD_KEY_90004=reserved
Raw
README.MD

How to disable a specific mouse button with udev rules

Execute sudo evtest

No device specified, trying to scan all of /dev/input/event*
Available devices:
/dev/input/event0:	Lid Switch
/dev/input/event1:	Power Button
/dev/input/event2:	Sleep Button
/dev/input/event3:	Power Button
/dev/input/event4:	AT Translated Set 2 keyboard
/dev/input/event5:	Video Bus
/dev/input/event21:	Kingsis Peripherals Evoluent VerticalMouse 4
Select the device event number [0-27]: 21

Select your device from the list, then click the mouse button you wish to disable and observe the output:

Event: time 1712048987.316403, type 4 (EV_MSC), code 4 (MSC_SCAN), value 90004
Event: time 1712048987.316403, type 1 (EV_KEY), code 275 (BTN_SIDE), value 1
Event: time 1712048987.316403, -------------- SYN_REPORT ------------
Event: time 1712048987.482414, type 4 (EV_MSC), code 4 (MSC_SCAN), value 90004
Event: time 1712048987.482414, type 1 (EV_KEY), code 275 (BTN_SIDE), value 0

Note the device name (trailing wildcards can be used) and the MSC_SCAN value, then add a rule to /etc/udev/hwdb.d/61-evdev-local.hwdb

Execute sudo systemd-hwdb update, and finally unplug the device and then plug it back in again.

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