1.\" 2.\" Copyright (c) 2004 Mark Santcroos <marks@ripe.net> 3.\" All rights reserved. 4.\" 5.\" Redistribution and use in source and binary forms, with or without 6.\" modification, are permitted provided that the following conditions 7.\" are met: 8.\" 1. Redistributions of source code must retain the above copyright 9.\" notice, this list of conditions and the following disclaimer. 10.\" 2. Redistributions in binary form must reproduce the above copyright 11.\" notice, this list of conditions and the following disclaimer in the 12.\" documentation and/or other materials provided with the distribution. 13.\" 14.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 15.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 16.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 17.\" ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 18.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 19.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 20.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 21.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 22.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 23.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 24.\" SUCH DAMAGE. 25.\" 26.\" $FreeBSD$ 27.\" 28.Dd March 03, 2004 29.Dt ACPI_VIDEO 4 30.Os 31.Sh NAME 32.Nm acpi_video 33.Nd ACPI Video Extensions driver 34.Sh SYNOPSIS 35.Cd "device acpi_video" 36.Sh DESCRIPTION 37This driver uses the ACPI Video Extensions to control display switching and 38backlight brightness. 39The availability of the 40.Xr sysctl 8 41variables depends on the functions offered by the hosts ACPI implementation. 42.Sh SYSCTLS 43The following sysctls are currently implemented, 44where <device> is "crt", "lcd" or "tv": 45.Bl -tag -width indent 46.It Va hw.acpi.video.<device>.active 47Current state of the device. 48.It Va hw.acpi.video.<device>.levels 49List of supported brightness levels. 50.It Va hw.acpi.video.<device>.brightness 51Current brightness level of the device. 52.It Va hw.acpi.video.<device>.fullpower 53Preset brightness level to be used in full power mode. 54.It Va hw.acpi.video.<device>.economy 55Preset brightness level to be used in economy mode. 56.El 57.Pp 58Defaults for these variables can be set in 59.Xr sysctl.conf 5 , 60which is parsed at boot-time. 61.Sh SEE ALSO 62.Xr acpi 4 , 63.Xr loader.conf 5 , 64.Xr sysctl.conf 5 , 65.Xr sysctl 8 66.Sh HISTORY 67The 68.Nm 69driver first appeared in 70.Fx 5.3 . 71.Sh AUTHORS 72.An -nosplit 73The 74.Nm 75driver was written by 76.An Taku YAMAMOTO Aq taku@cent.saitama-u.ac.jp . 77This manual page was written by 78.An Mark Santcroos Aq marks@ripe.net . 79