1ee5e90daSXin LI.\" Copyright (c) 2008 Yahoo!, Inc. 2ee5e90daSXin LI.\" All rights reserved. 3ee5e90daSXin LI.\" Written by: John Baldwin <jhb@FreeBSD.org> 4ee5e90daSXin LI.\" 5ee5e90daSXin LI.\" Redistribution and use in source and binary forms, with or without 6ee5e90daSXin LI.\" modification, are permitted provided that the following conditions 7ee5e90daSXin LI.\" are met: 8ee5e90daSXin LI.\" 1. Redistributions of source code must retain the above copyright 9ee5e90daSXin LI.\" notice, this list of conditions and the following disclaimer. 10ee5e90daSXin LI.\" 2. Redistributions in binary form must reproduce the above copyright 11ee5e90daSXin LI.\" notice, this list of conditions and the following disclaimer in the 12ee5e90daSXin LI.\" documentation and/or other materials provided with the distribution. 13ee5e90daSXin LI.\" 3. Neither the name of the author nor the names of any co-contributors 14ee5e90daSXin LI.\" may be used to endorse or promote products derived from this software 15ee5e90daSXin LI.\" without specific prior written permission. 16ee5e90daSXin LI.\" 17ee5e90daSXin LI.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 18ee5e90daSXin LI.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 19ee5e90daSXin LI.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 20ee5e90daSXin LI.\" ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 21ee5e90daSXin LI.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 22ee5e90daSXin LI.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 23ee5e90daSXin LI.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 24ee5e90daSXin LI.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 25ee5e90daSXin LI.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 26ee5e90daSXin LI.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 27ee5e90daSXin LI.\" SUCH DAMAGE. 28ee5e90daSXin LI.\" 29ee5e90daSXin LI.Dd August 23, 2008 30ee5e90daSXin LI.Dt DPMS 4 31ee5e90daSXin LI.Os 32ee5e90daSXin LI.Sh NAME 33ee5e90daSXin LI.Nm dpms 34ee5e90daSXin LI.Nd VESA BIOS DPMS driver 35ee5e90daSXin LI.Sh SYNOPSIS 36ee5e90daSXin LI.Cd "device dpms" 37ee5e90daSXin LI.Sh DESCRIPTION 38ee5e90daSXin LIThe 39ee5e90daSXin LI.Nm 40ee5e90daSXin LIdriver uses the VESA BIOS to manage an external display during suspend and 41ee5e90daSXin LIresume. 42ee5e90daSXin LIWhen the machine suspends, 43ee5e90daSXin LIthe 44ee5e90daSXin LI.Nm 45ee5e90daSXin LIdriver turns the external display off. 46ee5e90daSXin LIWhen the machine resumes, 47ee5e90daSXin LIit restores the display to its state when the driver was first loaded. 48ee5e90daSXin LI.Sh SEE ALSO 49ee5e90daSXin LI.Xr acpi_video 4 50ee5e90daSXin LI.Sh BUGS 51ee5e90daSXin LIThe VESA BIOS DPMS calls do not provide any way to identify a particular 52ee5e90daSXin LIdisplay or adapter to manipulate. 53ee5e90daSXin LIAs a result, 54ee5e90daSXin LIthis driver may have unexpected results on systems with multiple displays 55ee5e90daSXin LIand/or adapters. 56