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+.\" Copyright (c) 2005 Christian Brueffer
+.\" All rights reserved.
+.\"
+.\" 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 AUTHOR AND CONTRIBUTORS ``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 AUTHOR OR CONTRIBUTORS 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 February 8, 2010
+.Dt ACPI_SONY 4
+.Os
+.Sh NAME
+.Nm acpi_sony
+.Nd "ACPI notebook controller driver for Sony laptops"
+.Sh SYNOPSIS
+To compile this driver into the kernel,
+place the following line in your
+kernel configuration file:
+.Bd -ragged -offset indent
+.Cd "device acpi_sony"
+.Ed
+.Pp
+Alternatively, to load the driver as a
+module at boot time, place the following line in
+.Xr loader.conf 5 :
+.Bd -literal -offset indent
+acpi_sony_load="YES"
+.Ed
+.Sh DESCRIPTION
+The
+.Nm
+driver provides support for the notebook controller in Sony laptops.
+Note that not all features will work on all laptop models.
+.Sh SYSCTLS
+The following sysctl nodes are currently implemented:
+.Bl -tag -width indent
+.It Va dev.acpi_sony.0.brightness
+Current brightness level of the display.
+.It Va dev.acpi_sony.0.brightness_default
+Default brightness level of the display (survives reboot).
+.It Va dev.acpi_sony.0.contrast
+Current contrast level of the display.
+.It Va dev.acpi_sony.0.bass_gain
+Enable or disable the Bass Gain feature.
+.It Va dev.acpi_sony.0.cdp
+Turns the CD power on or off.
+.It Va dev.acpi_sony.0.azp
+Turns the audio power on or off.
+.It Va dev.acpi_sony.0.lnp
+Turns the wired network interface power on or off.
+.El
+.Sh SEE ALSO
+.Xr acpi 4 ,
+.Xr sysctl 8
+.Sh HISTORY
+The
+.Nm
+driver first appeared in
+.Fx 6.0 .
+.Sh AUTHORS
+The
+.Nm
+driver was written by
+.An Takanori Watanabe Aq takawata@FreeBSD.org .