125 lines
3.6 KiB
Groff
125 lines
3.6 KiB
Groff
.\" $NetBSD: acpivga.4,v 1.3 2010/10/28 21:45:02 gsutre Exp $
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.\"
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.\" Copyright (c) 2010 The NetBSD Foundation, Inc.
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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 NETBSD FOUNDATION, INC. AND CONTRIBUTORS
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.\" ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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.\" TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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.\" PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
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.\" BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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.\" CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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.\" SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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.\" INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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.\" CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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.\" ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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.\" POSSIBILITY OF SUCH DAMAGE.
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.\"
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.Dd October 28, 2010
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.Dt ACPIVGA 4
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.Os
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.Sh NAME
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.Nm acpivga
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.Nd ACPI Display Adapter and Output Devices
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.Sh SYNOPSIS
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.Cd "acpivga* at acpi?"
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.Cd "acpiout* at acpivga?"
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.Sh DESCRIPTION
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The
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.Nm
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driver provides generic support for brightness control and output switching,
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through
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.Tn ACPI
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video extensions.
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The
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.Tn ACPI
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specification requires that systems containing a built-in display adapter
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implement these extensions in their
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.Tn ACPI
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BIOS.
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.Pp
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The driver handles brightness hotkeys and display switch hotkeys.
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In addition, the following
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.Xr sysctl 8
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read/write variables are provided (when hardware support is available):
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.Bl -tag -width Ds
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.It Va hw.acpi.acpivga0.bios_switch
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BIOS output switching policy.
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This boolean variable controls the behavior of the BIOS when a display
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switch hotkey is pressed.
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.Bl -tag -width xxx -compact
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.It Sy 1
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the BIOS should automatically switch outputs, with no interaction from
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.Nm .
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.It Sy 0
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the BIOS should only notify
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.Nm
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of the desired output state changes.
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.El
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.It Va hw.acpi.acpiout0.brightness
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Brightness level.
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This integer variable typically ranges from 0 to 100, but any integer value
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is accepted (the driver uses the closest brightness level supported by the
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device).
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.El
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.Pp
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Please note, however, that future versions of
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.Nm
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may remove these
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.Xr sysctl 8
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variables without prior notice.
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.Sh SEE ALSO
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.Xr acpi 4 ,
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.Xr vga 4 ,
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.Xr sysctl 8
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.Rs
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.%A Microsoft Corporation
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.%D December 4, 2001
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.%T Mobile System Displays and Windows
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.%N Version 1.2c
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.%U http://www.microsoft.com/whdc/archive/mobiledisplay.mspx
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.Re
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.Sh HISTORY
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The
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.Nm
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driver appeared in
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.Nx 6.0 .
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.Sh AUTHORS
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.An Gr\('egoire Sutre
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.Aq gsutre@NetBSD.org
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.Sh CAVEATS
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The
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.Nm
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driver only supports PCI/PCI-X/PCI-E display adapters.
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.Pp
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Many
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.Tn ACPI
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BIOSes implement only part of the
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.Tn ACPI
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video extensions.
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In particular, display output switching via these extensions often does not
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work.
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For this reason,
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.Nm
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enables
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.Va hw.acpi.acpivga0.bios_switch
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by default.
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If the display switch hotkey does not work with this default setting, try
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setting
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.Va hw.acpi.acpivga0.bios_switch
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to 0.
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.Pp
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Brightness level should be controlled via
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.Xr wsconsctl 8
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instead of
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.Xr sysctl 8 .
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