Advanced Configuration and Power Interface Specification

Advanced Configuration and Power Interface Specification
The return value is an integer that represents the amount of change in device temperature that is
meaningful to the platform and for which the platform requires notification via evaluation of the
_TPT object.
11.4.10 _PSL (Passive List)
This object is defined under a thermal zone and evaluates to a list of processor objects to be used for
passive cooling.
Arguments:
None
Return Value:
A variable-length Package containing a list of References to processor objects
The return value is a package consisting of references to all processor objects that will be used for
passive cooling when the zone’s passive cooling threshold (_PSV) is exceeded.
11.4.11 _PSV (Passive)
This optional object, if present under a thermal zone, evaluates to the temperature at which OSPM
must activate passive cooling policy.
Arguments:
None
Return Value:
An Integer containing the passive cooling temperature threshold in tenths of degrees Kelvin
The return value is an integer that represents tenths of degrees Kelvin. For example, 300.0 Kelvin is
represented by 3000.
If this object it present under a device, the device’s driver evaluates this object to determine the
device’s corresponding passive cooling temperature trip point. This value may then be used by the
device’s driver to program an internal device temperature sensor trip point. When this object is
present under a device, the device must contain a native OS device driver interface supporting a
passive cooling control.
11.4.12 _RTV (Relative Temperature Values)
This optional object may be present under a device or a thermal zone and is evaluated by OSPM to
determine whether the values returned by temperature trip point and current operating temperature
interfaces under the corresponding device or thermal zone represent absolute or relative temperature
values.
Arguments:
None
Return Value:
An Integer containing a relative versus absolute indicator
0 Temperatures are absolute
614 April, 2015 Version 6.0