4c18532bd0
When not adhering to this order, brightness sysctl's do not show up on some laptop. Submitted by: driesm.michiels@gmail.com Reviewed by: uqs Differential Revision: https://reviews.freebsd.org/D26073
99 lines
3.2 KiB
Groff
99 lines
3.2 KiB
Groff
.\"
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.\" Copyright (c) 2004 Mark Santcroos <marks@ripe.net>
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.\" All rights reserved.
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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 AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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.\" ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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.\" SUCH DAMAGE.
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.\"
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.\" $FreeBSD$
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.\"
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.Dd November 8, 2004
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.Dt ACPI_VIDEO 4
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.Os
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.Sh NAME
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.Nm acpi_video
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.Nd ACPI Video Extensions driver
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.Sh SYNOPSIS
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.Cd "device acpi_video"
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.Sh DESCRIPTION
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This driver uses the ACPI Video Extensions to control display switching and
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backlight brightness.
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The availability of the
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.Xr sysctl 8
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variables depends on the functions offered by the host's ACPI implementation.
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.Sh SYSCTL VARIABLES
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The following sysctls are currently implemented,
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where
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.Aq Ar device
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is
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.Va crt , lcd ,
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or
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.Va tv :
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.Bl -tag -width indent
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.It Va hw.acpi.video. Ns Ao Ar device Ac Ns Va .active
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Current state of the output device.
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.It Va hw.acpi.video. Ns Ao Ar device Ac Ns Va .levels
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List of supported brightness levels.
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.It Va hw.acpi.video. Ns Ao Ar device Ac Ns Va .brightness
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Current brightness level of the device.
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.It Va hw.acpi.video. Ns Ao Ar device Ac Ns Va .fullpower
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Preset brightness level to be used in full power mode.
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.It Va hw.acpi.video. Ns Ao Ar device Ac Ns Va .economy
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Preset brightness level to be used in economy mode.
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.El
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.Pp
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Defaults for these variables can be set in
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.Xr sysctl.conf 5 ,
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which is parsed at boot-time.
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.Sh COMPATIBILITY
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In order for
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.Nm
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to attach correctly,
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.Nm
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should be loaded after any of the DRM kernel modules.
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This can be achieved by setting the correct order in
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.Xr rc.conf 5
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using the kld_list directive.
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.Sh SEE ALSO
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.Xr acpi 4 ,
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.Xr loader.conf 5 ,
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.Xr sysctl.conf 5 ,
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.Xr sysctl 8
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.Sh HISTORY
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The
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.Nm
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driver first appeared in
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.Fx 5.3 .
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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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driver was written by
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.An Taku YAMAMOTO Aq Mt taku@cent.saitama-u.ac.jp .
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This manual page was written by
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.An Mark Santcroos Aq Mt marks@ripe.net .
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.Sh BUGS
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Some systems only perform output switching via SMM even though they export
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the proper information via ACPI.
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On such systems, the proper hotkeys or OEM driver (for example,
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.Xr acpi_toshiba 4 )
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must be used instead.
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