1.\" Copyright (c) 2003 Takanori Watanabe. 2.\" All rights reserved. 3.\" 4.\" Redistribution and use in source and binary forms, with or without 5.\" modification, are permitted provided that the following conditions 6.\" are met: 7.\" 1. Redistributions of source code must retain the above copyright 8.\" notice, this list of conditions and the following disclaimer. 9.\" 2. Redistributions in binary form must reproduce the above copyright 10.\" notice, this list of conditions and the following disclaimer in the 11.\" documentation and/or other materials provided with the distribution. 12.\" 13.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 14.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 15.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 16.\" ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 17.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 18.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 19.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 20.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 21.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 22.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 23.\" SUCH DAMAGE. 24.\" 25.\" $FreeBSD: src/share/man/man4/acpi_thermal.4,v 1.6 2004/02/03 04:18:55 njl Exp $ 26.\" $DragonFly: src/share/man/man4/acpi_thermal.4,v 1.2 2006/07/23 07:47:12 swildner Exp $ 27.\" 28.Dd December 27, 2003 29.Dt ACPI_THERMAL 4 30.Os 31.Sh NAME 32.Nm acpi_thermal 33.Nd ACPI thermal management subsystem 34.Sh SYNOPSIS 35.Cd "device acpi" 36.Sh DESCRIPTION 37The 38.Nm 39driver provides the thermal management features of the ACPI module. 40This driver has a 41.Xr sysctl 8 42interface. 43The sysctls export properties of each ACPI thermal zone object. 44.Pp 45There can be multiple thermal zones in a system. 46For example, each CPU and the enclosure could all be separate thermal 47zones, each with its own setpoints and cooling devices. 48Thermal zones are numbered sequentially in the order they appear in 49the AML. 50.Pp 51The 52.Nm 53driver also activates the active cooling system according to 54each thermal zone's setpoints. 55.Sh SYSCTLS 56.Bl -tag -width indent 57.It Va hw.acpi.thermal.tz%d.active 58Current active cooling system state. 59If this is non-negative, the appropriate _AC%d object is running. 60Set this value to the desired active cooling level to force 61the corresponding fan object to the appropriate level. 62.It Va hw.acpi.thermal.tz%d.thermal_flags 63Current thermal zone status. 64These are bit-masked values. 65.It Va hw.acpi.thermal.tz%d.temperature 66Current temperature for this zone. 67.It Va hw.acpi.thermal.tz%d._PSV 68Temperature to start passive cooling by throttling down CPU, etc. 69.It Va hw.acpi.thermal.tz%d._HOT 70Temperature to start critical suspend to disk (S4). 71.It Va hw.acpi.thermal.tz%d._CRT 72Temperature to start critical shutdown (S5). 73.It Va hw.acpi.thermal.tz%d._ACx 74Temperatures at which to switch to the corresponding active cooling 75level. 76For instance, values of 77.Qq Li "3200 3100" 78mean to switch on _AC0 at 320.0K 79and _AC1 at 310.0K. 80The lower the _ACx value, the higher the cooling power. 81.El 82.Pp 83All temperatures are represented in tenths of a Kelvin. 84For example, 300.0K is represented by the integer 3000. 85To convert to units of Centigrade, 86the formula is 87.Li "(x - 2731.5) / 10" . 88.Sh SEE ALSO 89.Xr acpi 4 , 90.Xr acpidump 8 91.Sh AUTHORS 92.An -nosplit 93.An Michael Smith 94.Pp 95This manual page was written by 96.An Takanori Watanabe . 97