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23 22BImportant Technology Information
A ctive Trip Point
2 3 3 B
Active cooling devices typically consume power and produce noise but are able to cool a thermal zone
without limiting system performance. The active cooling trip point declares the temperature threshold
OS uses to start/stop active cooling devices (fan).
P assive Cooling Trip Point
2 3 4 B
Passive cooling devices produce no noise, but may not be effective enough to cool the thermal zone. The
passive cooling trip point declares the temperature threshold in which the OS will start or stop passive
cooling. In this case it throttles the processor.
C ritical Trip Point
2 3 5 B
The OS performs an orderly, but critical, shutdown of the system when the temperature reaches the
critical trip point.
P rocessor Clock Throttling
2 3 6 B
The ACPI OS assesses the optimum CPU performance change necessary to lower the temperature using
the following equation:
ΔP[%] = TC1(Tn-Tn-1) + TC2(Tn-Tt)
ΔP is the performance delta, Tt is the target temperature = critical trip point. The two coefficients TC1
and TC2 and the sampling period TSP are hardware dependent constants that you must supply. (See the
setup options in the ACPI Control Submenu section in the BIOS Operation chapter).
It is up to you to set the cooling preference of the system by setting the appropriate trip points in the
BIOS setup.
Notes:
For more detailed information see Chapter 12 of the ACPI Specification.
Kontron User's Guide
51
coolMonster/PM
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