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7 Important Technology Information
Kontron User's Guide ETX CD 48
7.5.5 Processor Clock Throttling
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 = passive cooling trip point. The two
coefficients TC1 and TC2 and the sampling period TSP are hardware dependent constants the end user
must supply (setup options section ACPI Control Submenu).
It’s up to the end user to set the cooling preference of the system by setting the appropriate trip points
in the BIOS setup.
Note: See chapter 12 of the ACPI specification (www.acpi.info) for more details.
7.6 ACPI Suspend Modes and Resume Events
The ETX®-CD, supports the S1 (POS=Power On Suspend) state, S3 and S4.
S4 (=Save to Disk) is not supported by the BIOS (S4_BIOS) but it is supported by the following operating
systems:
➤
WinME
➤
Win2k
➤
WinXP (S4_OS=Hibernate)
The following events resume the system from S1:
➤
Power Button
➤
PS/2 Keyboard and Mouse IRQs (1 & 12)
➤
USB Wake Events
➤
PCI Bus signal PME#