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105 lines
3.5 KiB
Groff
105 lines
3.5 KiB
Groff
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.\"
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.\" Copyright (c) 2003 Takanori Watanabe.
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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. Redistributions in binary form must reproduce the above copyright
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.\" notice, this list of conditions and the following disclaimer in the
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.\" documentation and/or other materials provided with the distribution.
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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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.\" ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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.\" SUCH DAMAGE.
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.\"
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.\" $FreeBSD$
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.\"
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.Dd July 2, 2001
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.Dt ACPI_THERMAL 4
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.Os
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.Sh NAME
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.Nm acpi_thermal
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.Nd ACPI Thermal Management Support Subsystem
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.Sh SYNOPSIS
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.Cd "device acpi"
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.Pp
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.Sh DESCRIPTION
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The
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.Nm
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driver provides ACPI thermal handling feature as a part of
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ACPI module. This module has sysctl interface and devd notification
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interface. Sysctls export ACPI objects as is.
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The
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.Nm
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driver also activate active cooling system in accordance with appropriate
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acpi object.
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.Sh SYSCTLS
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.Bl -tag -width indent
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.It Va hw.acpi.thermal.tz%d.active
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Current active system running state.
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.It Va hw.acpi.thermal.tz%d.thermal_flags
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Current thermal zone status. This is bit-masked values.
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.It Va hw.acpi.thermal.tz%d.temperature
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exports _TMP object that means current temperature.
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.It Va hw.acpi.thermal.tz%d._PSV
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exports _PSV object that means the temperature to start
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passive cooling by throtting down CPU etc..
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.It Va hw.acpi.thermal.tz%d._HOT
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exports _HOT object that means the temperature to
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start critical suspend to disk
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.It Va hw.acpi.thermal.tz%d._CRT
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exports _CRT object that means the temperature to
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start critical shutdown.
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.It Va hw.acpi.thermal.tz%d._ACx
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exports _ACx objects that objects that means active
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cooling start values. The earlier value means the strengest
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active cooling temperature.
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.El
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All temperature is represents as tenth of Kelvin. For example
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300.0K is represented as by the integer 3000. To convert to Centigrade,
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the formula is (x - 2731.5) / 10.
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.Sh NOTIFYS
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Notifies are passed as a string beginning with
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"!system=ACPI subsystem=Thermal" the thermal zone instance
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is distingushed by ACPI object path in "type=" argument. The notify
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value is passed in "notify=" argument.
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.Bl -tag -width indent
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.It Va 0x80
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Temperature change.
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.It Va 0x81
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Trip point change.
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.It Va 0x82
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Device Lists change.
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.El
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.Sh SEE ALSO
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.Xr acpi 4
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.Rs
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.%A "Compaq Computer Corporation"
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.%A "Intel Corporation"
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.%A "Microsoft Corporation"
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.%A "Phoenix Technologies Ltd."
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.%A "Toshiba Corporation"
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.%D August 25, 2003
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.%T "Advanced Configuration and Power Interface Specification"
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.%O http://acpi.info/spec.htm
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.Re
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.Sh AUTHORS
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.An Michael Smith
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.Pp
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This manual page was written by
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.Pp
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.An Takanori Watanabe
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