Add a very simple dpms(4) driver that uses the VESA BIOS DPMS calls to

turn off the external display during suspend and restore it to its
original state on resume.

MFC after:	2 weeks

1 files changed, 58 insertions, 0 deletions

diff --git a/share/man/man4/man4.i386/dpms.4 b/share/man/man4/man4.i386/dpms.4
new file mode 100644
index 000000000000..2412b47924ed
--- /dev/null
+++ b/share/man/man4/man4.i386/dpms.4
@@ -0,0 +1,58 @@
+.\" Copyright (c) 2008 Yahoo!, Inc.
+.\" All rights reserved.
+.\" Written by: John Baldwin <jhb@FreeBSD.org>
+.\"
+.\" 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.
+.\" 3. Neither the name of the author nor the names of any co-contributors
+.\"    may be used to endorse or promote products derived from this software
+.\"    without specific prior written permission.
+.\"
+.\" 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 August 23, 2008
+.Dt DPMS 4
+.Os
+.Sh NAME
+.Nm dpms
+.Nd VESA BIOS DPMS driver
+.Sh SYNOPSIS
+.Cd "device dpms"
+.Sh DESCRIPTION
+The
+.Nm
+driver uses the VESA BIOS to manage an external display during suspend and
+resume.
+When the machine suspends,
+the
+.Nm
+driver turns the external display off.
+When the machine resumes,
+it restores the display to its state when the driver was first loaded.
+.Sh SEE ALSO
+.Xr acpi_video 4
+.Sh BUGS
+.Pp
+The VESA BIOS DPMS calls do not provide any way to identify a particular
+display or adapter to manipulate.
+As a result,
+this driver may have unexpected results on systems with multiple displays
+and/or adapters.