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.\" Copyright (c) 2003 Takanori Watanabe. .\" All rights reserved. .\" .\" Redistribution and use in source and binary forms, with or without .\" modification, are permitted provided that the following conditions .\" are met: .\" 1. Redistributions of source code must retain the above copyright .\" notice, this list of conditions and the following disclaimer. .\" 2. Redistributions in binary form must reproduce the above copyright .\" notice, this list of conditions and the following disclaimer in the .\" documentation and/or other materials provided with the distribution. .\" .\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND .\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE .\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE .\" ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE .\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL .\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS .\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) .\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT .\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY .\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF .\" SUCH DAMAGE. .\" .\" $FreeBSD: release/9.1.0/share/man/man4/acpi_thermal.4 167670 2007-03-18 00:57:07Z njl $ .\" .Dd March 17, 2007 .Dt ACPI_THERMAL 4 .Os .Sh NAME .Nm acpi_thermal .Nd ACPI thermal management subsystem .Sh SYNOPSIS .Cd "device acpi" .Sh DESCRIPTION The .Nm driver provides the thermal management features of the ACPI module. This driver has a .Xr sysctl 8 interface and a .Xr devd 8 notification interface. The sysctls export properties of each ACPI thermal zone object. .Pp There can be multiple thermal zones in a system. For example, each CPU and the enclosure could all be separate thermal zones, each with its own setpoints and cooling devices. Thermal zones are numbered sequentially in the order they appear in the AML. .Pp The .Nm driver also activates the active cooling system according to each thermal zone's setpoints. .Sh SYSCTL VARIABLES .Bl -tag -width indent .It Va hw.acpi.thermal.min_runtime Number of seconds to continue active cooling once started. A new active cooling level will not be selected until this interval expires. .It Va hw.acpi.thermal.polling_rate Number of seconds between polling the current temperature. .It Va hw.acpi.thermal.user_override If set to 1, allow user override of various setpoints (below). The original values for these settings are obtained from the BIOS and system overheating and possible damage could occur if changed. Default is 0 (no override). .It Va hw.acpi.thermal.tz%d.active Current active cooling system state. If this is non-negative, the appropriate _AC%d object is running. Set this value to the desired active cooling level to force the corresponding fan object to the appropriate level. .It Va hw.acpi.thermal.tz%d.passive_cooling If set to 1, passive cooling is enabled. It does cooling without fans using .Xr cpufreq 4 as the mechanism for controlling CPU speed. Default is enabled for tz0 where it is available. .It Va hw.acpi.thermal.tz%d.thermal_flags Current thermal zone status. These are bit-masked values. .It Va hw.acpi.thermal.tz%d.temperature Current temperature for this zone. .It Va hw.acpi.thermal.tz%d._PSV Temperature to start passive cooling by throttling down CPU, etc. This value can be overridden by the user. .It Va hw.acpi.thermal.tz%d._HOT Temperature to start critical suspend to disk (S4). This value can be overridden by the user. .It Va hw.acpi.thermal.tz%d._CRT Temperature to start critical shutdown (S5). This value can be overridden by the user. .It Va hw.acpi.thermal.tz%d._ACx Temperatures at which to switch to the corresponding active cooling level. The lower the _ACx value, the higher the cooling power. .El .Pp All temperatures are printed in Celsius. Values can be set in Celsius (by providing a trailing .Qq C ) or Kelvin (by leaving off any trailing letter). When setting a value by .Xr sysctl 8 , do not specify a trailing decimal (i.e., 90C instead of 90.0C). .Sh NOTIFIES Notifies are passed to userland via .Xr devd 8 . See .Pa /etc/devd.conf and .Xr devd.conf 5 for examples. The .Nm driver sends events with the following attributes: .Pp .Bl -tag -width "subsystem" -compact .It system .Li ACPI .It subsystem .Li Thermal .It type The fully qualified thermal zone object path as in the ASL. .It notify An integer designating the event: .Pp .Bl -tag -width indent -compact .It Li 0x80 Current temperature has changed. .It Li 0x81 One or more trip points (_ACx, _PSV) have changed. .It Li 0x82 One or more device lists (_ALx, _PSL, _TZD) have changed. .It Li 0xcc Non-standard notify that the system will shutdown if the temperature stays above _CRT or _HOT for one more poll cycle. .El .El .Sh SEE ALSO .Xr acpi 4 , .Xr cpufreq 4 , .Xr acpidump 8 .Sh AUTHORS .An -nosplit .An Michael Smith .Pp This manual page was written by .An Takanori Watanabe .