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