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BACKLIGHT(8)		     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 regis-
     tered 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 de-
		fault of 10 percent is used.

     decr|- [value]
		Increment the backlight level.	If no value is specified  a  de-
		fault 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 ports 15.quarterly	  July 19, 2022 		    BACKLIGHT(8)

Want to link to this manual page? Use this URL:
<https://man.freebsd.org/cgi/man.cgi?query=backlight&manpath=FreeBSD+15.1-RELEASE+and+Ports.quarterly>

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