mirror of
https://git.FreeBSD.org/src.git
synced 2024-12-25 11:37:56 +00:00
150 lines
4.9 KiB
Groff
150 lines
4.9 KiB
Groff
.\" 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.
|
|
.\"
|
|
.\" $FreeBSD$
|
|
.\"
|
|
.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 .
|