To enable the ambient light sensor on an HP EliteBook 8440p or 8460p run
# echo 1 > /sys/devices/platform/hp-wmi/als
To disable:
# echo 0 > /sys/devices/platform/hp-wmi/als
To enable the ambient light sensor on an HP EliteBook 8440p or 8460p run
# echo 1 > /sys/devices/platform/hp-wmi/als
To disable:
# echo 0 > /sys/devices/platform/hp-wmi/als