97 lines
2.8 KiB
Groff
97 lines
2.8 KiB
Groff
.\" 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.
|
|
.\"
|
|
.\" $FreeBSD$
|
|
.\"
|
|
.Dd March 03, 2021
|
|
.Dt BACKLIGHT 8
|
|
.Os
|
|
.Sh NAME
|
|
.Nm backlight
|
|
.Nd configure backlight hardware
|
|
.Sh SYNOPSIS
|
|
.Nm
|
|
.Op Fl f Ar device
|
|
.Op Fl i
|
|
.Op Fl q
|
|
.Op 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
|
|
.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 .
|