Disable internal laptop keyboard when external keyboard plugged in

98-input.rules

SUBSYSTEM=="input", ENV{ID_BUS}=="usb", ENV{ID_INPUT_LEOPARD}=="?*", ACTION=="add", SYMLINK+="kbd%n", RUN+="/usr/local/bin/kbdctl m"
SUBSYSTEM=="input", ENV{ID_BUS}=="usb", ENV{ID_INPUT_LEOPARD}=="?*", ACTION=="remove", RUN+="/usr/local/bin/kbdctl a"

kbdctl

#!/bin/bash

file="/sys/devices/platform/i8042/serio0/bind_mode"

if [ -n "$1" ]; then
	mode=$1
else
	mode=$(< $file)
	if [ "$mode" == "manual" ]; then
		mode="auto"
	else
		mode="manual"
	fi
fi

if [ "$mode" == "m" -o "$mode" == "manual" ]; then
	echo -n manual > $file
	echo -n psmouse > /sys/devices/platform/i8042/serio0/drvctl
elif [ "$mode" == "a" -o "$mode" == "auto" ]; then
	echo -n auto > $file
fi