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.

The LCD backlight is configured through the backlight(9) device driver. If the backlight(9) is not available, changes the ‘hw.acpi.video.lcd0.brightness’ sysctl value to configure.

The keyboard backlight is configured through the ‘dev.asmc.0.light.control’ sysctl value.

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.
key acpi: Adjust the keyboard backlight brightness based on whether the laptop is on AC power or battery power. Relies on acpi status.

FILES

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

REQUIREMENTS

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.