76 lines
2.2 KiB
Groff
76 lines
2.2 KiB
Groff
.\" $NetBSD
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.\"
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.\" Copyright (c) 2011 Jukka Ruohonen <jruohonen@iki.fi>
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.\" All rights reserved.
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.\"
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.\" Redistribution and use in source and binary forms, with or without
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.\" modification, are permitted provided that the following conditions
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.\" are met:
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.\" 1. Redistributions of source code must retain the above copyright
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.\" notice, this list of conditions and the following disclaimer.
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.\" 2. Neither the name of the author nor the names of any
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.\" contributors may be used to endorse or promote products derived
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.\" from this software without specific prior written permission.
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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS
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.\" ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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.\" TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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.\" PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
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.\" BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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.\" CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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.\" SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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.\" INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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.\" CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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.\" ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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.\" POSSIBILITY OF SUCH DAMAGE.
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.\"
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.Dd January 9, 2011
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.Dt ACPIFAN 4
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.Os
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.Sh NAME
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.Nm acpifan
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.Nd ACPI Fan
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.Sh SYNOPSIS
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.Cd "acpifan* at acpi?"
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.Sh DESCRIPTION
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The
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.Nm
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device driver supports fans possibly exposed by the
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.Tn BIOS .
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Even if a system contains only one physical fan, multiple
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.Nm
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instances may be present.
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In such cases each
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.Nm
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typically represents an
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.Xr acpitz 4
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thermal zone, and the combined state of all
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instances reveals the speed of the fan.
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.Pp
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The
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.Nm
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driver does not support controlling the fan.
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The current state (on or off) is made available through the
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.Xr envsys 4
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.Tn API
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and the
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.Xr envstat 8
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command.
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.Sh SEE ALSO
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.Xr acpi 4 ,
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.Xr acpitz 4
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.Sh HISTORY
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The
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.Nm
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device driver appeared in
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.Nx 6.0 .
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.Sh AUTHORS
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.An Jukka Ruohonen
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.Aq jruohonen@iki.fi
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.Sh BUGS
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The
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.Nm
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driver does not yet support additional functionality introduced in the
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.Tn ACPI
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4.0 specification.
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