FreeBSD manual

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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 <manu@FreeBSD.org>. FreeBSD 14.2-RELEASE July 19, 2022 FreeBSD 14.2-RELEASE