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 1.3 2008/10/03 10:33:49 swildner Exp $ 27.\" 28.Dd October 3, 2008 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 and a 43.Xr devd 8 44notification interface. 45The sysctls export properties of each ACPI thermal zone object. 46.Pp 47There can be multiple thermal zones in a system. 48For example, each CPU and the enclosure could all be separate thermal 49zones, each with its own setpoints and cooling devices. 50Thermal zones are numbered sequentially in the order they appear in 51the AML. 52.Pp 53The 54.Nm 55driver also activates the active cooling system according to 56each thermal zone's setpoints. 57.Sh SYSCTLS 58.Bl -tag -width indent 59.It Va hw.acpi.thermal.tz%d.active 60Current active cooling system state. 61If this is non-negative, the appropriate _AC%d object is running. 62Set this value to the desired active cooling level to force 63the corresponding fan object to the appropriate level. 64.It Va hw.acpi.thermal.tz%d.thermal_flags 65Current thermal zone status. 66These are bit-masked values. 67.It Va hw.acpi.thermal.tz%d.temperature 68Current temperature for this zone. 69.It Va hw.acpi.thermal.tz%d._PSV 70Temperature to start passive cooling by throttling down CPU, etc. 71.It Va hw.acpi.thermal.tz%d._HOT 72Temperature to start critical suspend to disk (S4). 73.It Va hw.acpi.thermal.tz%d._CRT 74Temperature to start critical shutdown (S5). 75.It Va hw.acpi.thermal.tz%d._ACx 76Temperatures at which to switch to the corresponding active cooling 77level. 78For instance, values of 79.Qq Li "3200 3100" 80mean to switch on _AC0 at 320.0K 81and _AC1 at 310.0K. 82The lower the _ACx value, the higher the cooling power. 83.El 84.Pp 85All temperatures are represented in tenths of a Kelvin. 86For example, 300.0K is represented by the integer 3000. 87To convert to units of Centigrade, 88the formula is 89.Li "(x - 2731.5) / 10" . 90.Sh NOTIFIES 91Notifies are passed to userland via 92.Xr devd 8 . 93See 94.Pa /etc/devd.conf 95and 96.Xr devd.conf 5 97for examples. 98The 99.Nm 100driver sends events with the following attributes: 101.Pp 102.Bl -tag -width "subsystem" -compact 103.It system 104.Li ACPI 105.It subsystem 106.Li Thermal 107.It type 108The fully qualified thermal zone object path as in the ASL. 109.It notify 110An integer designating the event: 111.Pp 112.Bl -tag -width indent -compact 113.It Li 0x80 114Current temperature has changed. 115.It Li 0x81 116One or more trip points (_ACx, _PSV) have changed. 117.It Li 0x82 118One or more device lists (_ALx, _PSL, _TZD) have changed. 119.It Li 0xcc 120Non-standard notify that the system will shutdown if the temperature 121stays above _CRT or _HOT for one more poll cycle. 122.El 123.El 124.Sh SEE ALSO 125.Xr acpi 4 , 126.Xr acpidump 8 127.Sh AUTHORS 128.An -nosplit 129.An Michael Smith 130.Pp 131This manual page was written by 132.An Takanori Watanabe . 133