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+.\" $NetBSD: acpifan.4,v 1.4 2019/04/11 17:46:32 kamil Exp $
+.\"
+.\" Copyright (c) 2011 Jukka Ruohonen <jruohonen@iki.fi>
+.\" 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. Neither the name of the author nor the names of any
+.\"    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 FOUNDATION 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.
+.\"
+.Dd January 9, 2011
+.Dt ACPIFAN 4
+.Os
+.Sh NAME
+.Nm acpifan
+.Nd ACPI Fan
+.Sh SYNOPSIS
+.Cd "acpifan* at acpi?"
+.Sh DESCRIPTION
+The
+.Nm
+device driver supports fans possibly exposed by the
+.Tn BIOS .
+Even if a system contains only one physical fan, multiple
+.Nm
+instances may be present.
+In such cases each
+.Nm
+typically represents an
+.Xr acpitz 4
+thermal zone, and the combined state of all
+instances reveals the speed of the fan.
+.Pp
+The
+.Nm
+driver does not support controlling the fan.
+The current state (on or off) is made available through the
+.Xr envsys 4
+.Tn API
+and the
+.Xr envstat 8
+command.
+.Sh SEE ALSO
+.Xr acpi 4 ,
+.Xr acpitz 4
+.Sh HISTORY
+The
+.Nm
+device driver appeared in
+.Nx 6.0 .
+.Sh AUTHORS
+.An Jukka Ruohonen
+.Aq jruohonen@iki.fi
+.Sh BUGS
+The
+.Nm
+driver does not yet support additional functionality introduced in the
+.Tn ACPI
+4.0 specification.