Initial xbacklight program

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+.\"
+.\" Copyright © 2007 Keith Packard.\"
+.\" Permission to use, copy, modify, distribute, and sell this software and its
+.\" documentation for any purpose is hereby granted without fee, provided that
+.\" the above copyright notice appear in all copies and that both that
+.\" copyright notice and this permission notice appear in supporting
+.\" documentation, and that the name of Keith Packard not be used in
+.\" advertising or publicity pertaining to distribution of the software without
+.\" specific, written prior permission.  Keith Packard makes no
+.\" representations about the suitability of this software for any purpose.  It
+.\" is provided "as is" without express or implied warranty.
+.\"
+.\" KEITH PACKARD DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE,
+.\" INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO
+.\" EVENT SHALL KEITH PACKARD BE LIABLE FOR ANY SPECIAL, INDIRECT OR
+.\" CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE,
+.\" DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER
+.\" TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
+.\" PERFORMANCE OF THIS SOFTWARE.
+.\"
+.\"
+.TH XBACKLIGHT __appmansuffix__ __vendorversion__
+.SH NAME
+xbacklight \- adjust backlight brightness using RandR extension
+.SH SYNOPSIS
+.B "xbacklight"
+[-help]  [-display \fIdisplay\fP]
+[-get]
+[-set percent]
+[-inc percent]
+[-dec percent]
+.SH DESCRIPTION
+.I Xbacklight
+is used to adjust the backlight brightness where supported. It finds all
+outputs on the X server supporting backlight brightness control and changes
+them all in the same way.
+.IP -get
+Print out the current backlight brightness of each output with such a
+control. The brightness is represented as a percentage of the maximum
+brightness supported.
+.IP "-set \fIpercent\fP"
+Sets each backlight brightness to the specified level.
+.IP "-inc \fIpercent\fP"
+Increases brightness by the specified amount.
+.IP "-dec \fIpercent\fP"
+Decreases brightness by the specified amount.
+.IP --help
+Print out a summary of the usage and exit.
+.SH "SEE ALSO"
+Xrandr(3)
+.SH AUTHORS
+Keith Packard,
+Open Source Technology Center, Intel Corporation.