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+.\" Copyright (c) 2020 Emmanuel Vadot <manu@freebsd.org>
+.\"
+.\" Redistribution and use in source and binary forms, with or without
+.\" modification, are permitted provided that the following conditions
+.\" are met:
+.\" 1. Redistributions of source code must retain the above copyright
+.\"    notice, this list of conditions and the following disclaimer.
+.\" 2. Redistributions in binary form must reproduce the above copyright
+.\"    notice, this list of conditions and the following disclaimer in the
+.\"    documentation and/or other materials provided with the distribution.
+.\"
+.\" THIS SOFTWARE IS PROVIDED BY THE DEVELOPERS ``AS IS'' AND ANY EXPRESS OR
+.\" IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
+.\" OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
+.\" IN NO EVENT SHALL THE DEVELOPERS BE LIABLE FOR ANY DIRECT, INDIRECT,
+.\" INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
+.\" NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+.\" DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+.\" THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+.\" (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
+.\" THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+.\"
+.Dd July 19, 2022
+.Dt BACKLIGHT 8
+.Os
+.Sh NAME
+.Nm backlight
+.Nd configure backlight hardware
+.Sh SYNOPSIS
+.Nm
+.Op Fl q
+.Op Fl f Ar device
+.Nm
+.Op Fl q
+.Op Fl f Ar device
+.Fl i
+.Nm
+.Op Fl f Ar device
+.Ar value
+.Nm
+.Op Fl f Ar device
+.Cm incr Ns | Ns Cm +
+.Op Ar value
+.Nm
+.Op Fl f Ar device
+.Cm decr Ns | Ns Cm -
+.Op Ar value
+.Sh DESCRIPTION
+The
+.Nm
+utility can be used to configure brightness levels for registered backlights.
+.Pp
+Called without any arguments it will print the current brightness level
+of the first registered backlight.
+.Pp
+The options are as follows:
+.Bl -tag -width "-f device"
+.It Fl f Ar device
+Device to operate on.
+If not specified,
+.Pa /dev/backlight/backlight0
+is used.
+If an unqualified name is provided,
+.Pa /dev/backlight/
+is automatically prepended.
+.It Fl i
+Query information about the backlight (name, type).
+.It Fl q
+When querying the brightness level only print the value.
+.It Ar value
+Set the brightness level to this value, must be between 0 and 100.
+A trailing
+.Dq %
+is valid.
+.It Cm incr Ns | Ns Cm + Op Ar value
+Increment the backlight level.
+If no value is specified a default of 10 percent is used.
+.It Cm decr Ns | Ns Cm - Op Ar value
+Decrement the backlight level.
+If no value is specified a default of 10 percent is used.
+.El
+.Sh EXAMPLES
+Show the current brightness level:
+.Bd -literal -offset indent
+$ backlight -f /dev/backlight/backlight0
+brightness: 98
+.Ed
+.Sh SEE ALSO
+.Xr backlight 9
+.Sh HISTORY
+The
+.Nm
+utility appeared in
+.Fx 13.0 .
+.Sh AUTHORS
+.An -nosplit
+The
+.Nm
+utility and this manual page were written by
+.An Emmanuel Vadot Aq Mt manu@FreeBSD.org .