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+.\" $OpenBSD: abtn.4,v 1.1 2001/08/21 19:58:03 drahn Exp $
+.\"
+.\" Copyright (c) 2001 Peter Philipp
+.\" 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.
+.\" 3. The name of the author may not be used to endorse or promote products
+.\"    derived from this software without specific prior written permission
+.\"
+.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 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.
+.\"
+.\"
+.Dd July 30, 2001
+.Dt ABTN 4 powerpc
+.Os 
+.Sh NAME
+.Nm abtn 
+.Nd apple brightness/volume button control
+.Sh SYNOPSIS
+.Cd "abtn at adb?"
+.Sh DESCRIPTION
+The 
+.Nm
+driver allows you to dim the brightness of your display.  This driver only
+currently recognizes the dim and brightness button.  Sound, numlock and
+eject buttons are also handled by this driver but are silently ignored.
+.Sh SEE ALSO
+.Xr adb 4, 
+.Xr aed 4
+.Sh AUTHOR
+abtn was written by Tsubai Masanari for NetBSD.
+.Sh BUGS
+The bright/dim buttons currently don't work on new 2001 iBooks.  It's best
+to just disable the driver to avoid freeze ups when pressing these buttons.