freebsd-src/usr.bin/backlight/backlight.8
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.\" Copyright (c) 2020 Emmanuel Vadot <manu@freebsd.org>
.\"
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.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
Decrement the backlight level.
If no value is specified a default of 10 percent is used.
.It Cm decr Ns | Ns Cm - Op Ar value
Increment 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 .