NAME

asmctl —

controlling keyboard backlight and LCD backlight

SYNOPSIS

asmctl video [up | down | acpi]

asmctl key [up | down]

DESCRIPTION

The asmctl command controls LCD backlight and keyboard backlight by setting following sysctl(8) variables.

hw.acpi.video.lcd0.brightness

dev.asmc.0.light.control

OPTIONS

video up: Brighten the LCD backlight.
video down: Dim the LCD backlight
video acpi: Adjust the LCD backlight brightness based on whether the laptop is on AC power or battery power. Relies on acpi status.
key up: Brighten the keyboard backlight.
key down: Dim the keyboard backlight.

FILES

/var/lib/asmctl.conf: Saved sysctl(8) values for next boot.

REQUIERMENTS

The following kernel modules are required.

asmc.ko

acpi_video.ko

SECURITY

Changing hw.acpi.video.* sysctl variables requires root privilege. For this reason, asmctl is installed with setuid root. On FreeBSD-11.0R or higher, asmctl uses capsicum(4) to be sandboxed.