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.\" $FreeBSD$ 26.\" 27.Dd December 27, 2003 28.Dt ACPI_THERMAL 4 29.Os 30.Sh NAME 31.Nm acpi_thermal 32.Nd ACPI thermal management subsystem 33.Sh SYNOPSIS 34.Cd "device acpi" 35.Sh DESCRIPTION 36The 37.Nm 38driver provides the thermal management features of the ACPI module. 39This driver has a 40.Xr sysctl 8 41interface and a 42.Xr devd 8 43notification interface. 44The sysctls export properties of each ACPI thermal zone object. 45.Pp 46There can be multiple thermal zones in a system. 47For example, each CPU and the enclosure could all be separate thermal 48zones, each with its own setpoints and cooling devices. 49Thermal zones are numbered sequentially in the order they appear in 50the AML. 51.Pp 52The 53.Nm 54driver also activates the active cooling system according to 55each thermal zone's setpoints. 56.Sh SYSCTLS 57.Bl -tag -width indent 58.It Va hw.acpi.thermal.tz%d.active 59Current active cooling system state. 60If this is non-negative, the appropriate _AC%d object is running. 61Set this value to the desired active cooling level to force 62the corresponding fan object to the appropriate level. 63.It Va hw.acpi.thermal.tz%d.thermal_flags 64Current thermal zone status. 65These are bit-masked values. 66.It Va hw.acpi.thermal.tz%d.temperature 67Current temperature for this zone. 68.It Va hw.acpi.thermal.tz%d._PSV 69Temperature to start passive cooling by throttling down CPU, etc. 70.It Va hw.acpi.thermal.tz%d._HOT 71Temperature to start critical suspend to disk (S4). 72.It Va hw.acpi.thermal.tz%d._CRT 73Temperature to start critical shutdown (S5). 74.It Va hw.acpi.thermal.tz%d._ACx 75Temperatures at which to switch to the corresponding active cooling 76level. 77For instance, values of 78.Qq Li "3200 3100" 79mean to switch on _AC0 at 320.0K 80and _AC1 at 310.0K. 81The lower the _ACx value, the higher the cooling power. 82.El 83.Pp 84All temperatures are represented in tenths of a Kelvin. 85For example, 300.0K is represented by the integer 3000. 86To convert to units of Centigrade, 87the formula is 88.Li "(x - 2731.5) / 10" . 89.Sh NOTIFIES 90Notifies are passed to userland via 91.Xr devd 8 . 92See 93.Pa /etc/devd.conf 94and 95.Xr devd.conf 5 96for examples. 97The 98.Nm 99driver sends events with the following attributes: 100.Pp 101.Bl -tag -width "subsystem" -compact 102.It system 103.Li ACPI 104.It subsystem 105.Li Thermal 106.It type 107The fully qualified thermal zone object path as in the ASL. 108.It notify 109An integer designating the event: 110.Pp 111.Bl -tag -width indent -compact 112.It Li 0x80 113Current temperature has changed. 114.It Li 0x81 115One or more trip points (_ACx, _PSV) have changed. 116.It Li 0x82 117One or more device lists (_ALx, _PSL, _TZD) have changed. 118.It Li 0xcc 119Non-standard notify that the system will shutdown if the temperature 120stays above _CRT or _HOT for one more poll cycle. 121.El 122.El 123.Sh SEE ALSO 124.Xr acpi 4 , 125.Xr acpidump 8 126.Sh AUTHORS 127.An -nosplit 128.An Michael Smith 129.Pp 130This manual page was written by 131.An Takanori Watanabe . 132