diff options
Diffstat (limited to 'share/man/man4/acpi_thermal.4')
| -rw-r--r-- | share/man/man4/acpi_thermal.4 | 149 |
1 files changed, 149 insertions, 0 deletions
diff --git a/share/man/man4/acpi_thermal.4 b/share/man/man4/acpi_thermal.4 new file mode 100644 index 0000000..d1cf8ee --- /dev/null +++ b/share/man/man4/acpi_thermal.4 @@ -0,0 +1,149 @@ +.\" 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 . |
