BACKLIGHT(8) FreeBSD System Manager's Manual BACKLIGHT(8)
NAME
backlight - configure backlight hardware
SYNOPSIS
backlight [-q] [-f device]
backlight [-q] [-f device] -i
backlight [-f device] value
backlight [-f device] incr|+ [value]
backlight [-f device] decr|- [value]
DESCRIPTION
The backlight utility can be used to configure brightness levels for
registered backlights.
Called without any arguments 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.
EXAMPLES
Show the current brightness level:
$ backlight -f /dev/backlight/backlight0
brightness: 98
SEE ALSO
backlight(9)
HISTORY
The backlight utility appeared in FreeBSD 13.0.
AUTHORS
The backlight utility and this manual page were written by Emmanuel Vadot
<
[email protected]>.
FreeBSD 14.1-RELEASE-p8 July 19, 2022 FreeBSD 14.1-RELEASE-p8