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ACPI_THERMAL(4)		 BSD Kernel Interfaces Manual	       ACPI_THERMAL(4)

     acpi_thermal — ACPI thermal management subsystem

     device acpi

     The acpi_thermal driver provides the thermal management features of the
     ACPI module.  This driver has a sysctl(8) interface and a devd(8) notifi‐
     cation interface.	The sysctls export properties of each ACPI thermal
     zone object.

     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.

     The acpi_thermal driver also activates the active cooling system accord‐
     ing to each thermal zone's setpoints.

	     Number of seconds to continue active cooling once started.	 A new
	     active cooling level will not be selected until this interval

	     Number of seconds between polling the current temperature.

	     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).
	     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.
	     If set to 1, passive cooling is enabled.  It does cooling without
	     fans using cpufreq(4) as the mechanism for controlling CPU speed.
	     Default is enabled for tz0 where it is available.
	     Current thermal zone status.  These are bit-masked values.
	     Current temperature for this zone.
	     Temperature to start passive cooling by throttling down CPU, etc.
	     This value can be overridden by the user.
	     Temperature to start critical suspend to disk (S4).  This value
	     can be overridden by the user.
	     Temperature to start critical shutdown (S5).  This value can be
	     overridden by the user.
	     Temperatures at which to switch to the corresponding active cool‐
	     ing level.	 The lower the _ACx value, the higher the cooling

     All temperatures are printed in Celsius.  Values can be set in Celsius
     (by providing a trailing "C") or Kelvin (by leaving off any trailing let‐
     ter).  When setting a value by sysctl(8), do not specify a trailing deci‐
     mal (i.e., 90C instead of 90.0C).

     Notifies are passed to userland via devd(8).  See /etc/devd.conf and
     devd.conf(5) for examples.	 The acpi_thermal driver sends events with the
     following attributes:

     system	ACPI
     subsystem	Thermal
     type	The fully qualified thermal zone object path as in the ASL.
     notify	An integer designating the event:

		0x80	Current temperature has changed.
		0x81	One or more trip points (_ACx, _PSV) have changed.
		0x82	One or more device lists (_ALx, _PSL, _TZD) have
		0xcc	Non-standard notify that the system will shutdown if
			the temperature stays above _CRT or _HOT for one more
			poll cycle.

     acpi(4), cpufreq(4), acpidump(8)

     Michael Smith

     This manual page was written by Takanori Watanabe.

BSD				March 17, 2007				   BSD

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