Advanced Configuration and Power Interface Specification

Thermal Management
Package (){
Revision,
Control,
Speed
}
// Integer
// Integer DWORD
// Integer DWORD
Table 11-285 FST Package Details
Field Format Description
Revision Integer Current revision is: 0
Control Integer
(DWORD)
The current control value used to operate the Fan. If the fan is not operating
Control will be zero. If the fan is operating, Control is the Level argument passed
in the evaluation of the _FSL object.
Speed
Integer
(DWORD)
The current fan speed in revolutions per minute at which the fan is rotating. A
value of 0xFFFFFFFF indicates that the fan does not support speed reporting.
11.4 Thermal Objects
Objects related to thermal management are listed in the following table.
Table 11-286 Thermal Objects
Object
_ACx
_ALx
_ART
_CRT
_HOT
_MTL
_NTT
_PSL
_PSV
_RTV
_SCP
_TC1
_TC2
_TFP
_TMP
_TPT
Description
Returns active cooling policy threshold values in tenths of degrees.
List of active cooling device objects.
Table of values that convey the Active Cooling Relationship between devices
Returns critical trip point in tenths of degrees where OSPM must perform a critical shutdown.
Returns critical trip point in tenths of degrees where OSPM may choose to transition the system
into S4.
Returns the minimum throttle limit of a zone, when defined under a thermal zone. T
Returns the temperature change threshold for devices containing native temperature sensors to
cause evaluation of the _TPT object
List of processor device objects for clock throttling.
Returns the passive cooling policy threshold value in tenths of degrees.
Conveys whether temperatures are expressed in terms of absolute or relative values.
Sets platform cooling policy (active or passive).
Thermal constant for passive cooling.
Thermal constant for passive cooling.
Thermal fast sampling period for Passive cooling in milliseconds.
Returns the thermal zone’s current temperature in tenths of degrees.
Conveys the temperature of a devices internal temperature sensor to the platform when a
temperature trip point is crossed or a meaningful change in temperature occurs.
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