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139 lines
4.3 KiB
Groff
139 lines
4.3 KiB
Groff
.\" 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 December 27, 2003
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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 subsystem
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.Sh SYNOPSIS
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.Cd "device acpi"
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.Sh DESCRIPTION
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The
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.Nm
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driver provides the thermal management features of the ACPI module.
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This driver has a
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.Xr sysctl 8
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interface and a
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.Xr devd 8
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notification interface.
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The sysctls export properties of each ACPI thermal zone object.
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.Pp
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There can be multiple thermal zones in a system.
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For example, each CPU and the enclosure could all be separate thermal
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zones, each with its own setpoints and cooling devices.
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Thermal zones are numbered sequentially in the order they appear in
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the AML.
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.Pp
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The
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.Nm
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driver also activates the active cooling system according to
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each thermal zone's setpoints.
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.Sh SYSCTL VARIABLES
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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 cooling system state.
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If this is non-negative, the appropriate _AC%d object is running.
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Set this value to the desired active cooling level to force
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the corresponding fan object to the appropriate level.
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.It Va hw.acpi.thermal.tz%d.passive_cooling
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If set to 1, passive cooling is enabled.
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It does cooling without fans using
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.Xr cpufreq 4
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as the mechanism for controlling CPU speed.
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Default is enabled for tz0 where it is available.
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.It Va hw.acpi.thermal.tz%d.thermal_flags
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Current thermal zone status.
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These are bit-masked values.
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.It Va hw.acpi.thermal.tz%d.temperature
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Current temperature for this zone.
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.It Va hw.acpi.thermal.tz%d._PSV
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Temperature to start passive cooling by throttling down CPU, etc.
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.It Va hw.acpi.thermal.tz%d._HOT
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Temperature to start critical suspend to disk (S4).
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.It Va hw.acpi.thermal.tz%d._CRT
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Temperature to start critical shutdown (S5).
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.It Va hw.acpi.thermal.tz%d._ACx
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Temperatures at which to switch to the corresponding active cooling
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level.
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For instance, values of
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.Qq Li "3200 3100"
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mean to switch on _AC0 at 320.0K
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and _AC1 at 310.0K.
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The lower the _ACx value, the higher the cooling power.
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.El
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.Pp
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All temperatures are represented in tenths of a Kelvin.
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For example, 300.0K is represented by the integer 3000.
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To convert to units of Centigrade,
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the formula is
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.Li "(x - 2731.5) / 10" .
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.Sh NOTIFIES
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Notifies are passed to userland via
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.Xr devd 8 .
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See
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.Pa /etc/devd.conf
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and
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.Xr devd.conf 5
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for examples.
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The
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.Nm
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driver sends events with the following attributes:
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.Pp
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.Bl -tag -width "subsystem" -compact
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.It system
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.Li ACPI
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.It subsystem
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.Li Thermal
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.It type
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The fully qualified thermal zone object path as in the ASL.
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.It notify
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An integer designating the event:
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.Pp
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.Bl -tag -width indent -compact
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.It Li 0x80
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Current temperature has changed.
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.It Li 0x81
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One or more trip points (_ACx, _PSV) have changed.
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.It Li 0x82
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One or more device lists (_ALx, _PSL, _TZD) have changed.
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.It Li 0xcc
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Non-standard notify that the system will shutdown if the temperature
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stays above _CRT or _HOT for one more poll cycle.
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.El
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.El
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.Sh SEE ALSO
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.Xr acpi 4 ,
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.Xr cpufreq 4 ,
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.Xr acpidump 8
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.Sh AUTHORS
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.An -nosplit
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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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.An Takanori Watanabe .
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