NAME

backlight —

configure backlight hardware

SYNOPSIS

backlight [-f device] [-i] [-q] [value]

backlight [-f device] incr|+ [value]

backlight [-f device] decr|- [value]

The backlight utility can be used to configure brightness levels for registered backlights.

If call without any option it will print the current brightness level of the first registered backlight.

The options are as follows:

-f device: Device to operate on. If not specified, /dev/backlight/backlight0 is used. If an unqualified name is provided, /dev/backlight is automatically prepended.
-i: Query information about the backlight (name, type).
-q: When querying the brightness level only print the value.
value: Set the brightness level to this value, must be between 0 and 100. A trailing “%” is valid.
incr|+ [value]: Decrement the backlight level. If no value is specified a default of 10 percent is used.
decr|- [value]: Increment the backlight level. If no value is specified a default of 10 percent is used.

Show the current brightness level

backlight -f /dev/backlight/backlight0

The backlight utility appeared in FreeBSD 13.0.

The backlight utility and this manual page were written by Emmanuel Vadot <manu@FreeBSD.org>.