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7.4
Thermal Management
ACPI allows the operating system to play an important part in the system’s thermal management. This helps the operating system to implement
cooling decisions according to the demands of the application.
The conga-TS570 offers hardware-based support for passive and active cooling. Passive cooling is implemented in the Intel CPU via the
Thermal Control Circuit (TCC ) Activation Offset setting in the CPU configuration setup sub-menu. The TCC in the processor is activated at
100°C by default but can be lowered by the Activation Offset. For example, an activation offset of “10” will activate TCC at 90°C (ACPI OS
support is not required). See section 7.1 “Adaptive Thermal Monitor and Catastrophic Thermal Protection” for more information.
The congatec board controller supports active cooling solution. The board controller controls the fan’s speed based on the temperature
readings of the CPU. This feature does not require ACPI OS support. The only software-controlled thermal trip point on conga-TS570 is the
Critical Trip Point.
The active or passive cooling policy should ensure that the CPU temperature does not reach this trip point. However, if the critical trip point is
reached, the OS will shut down properly in order to prevent damage to the system.
Note
Use the “critical trip point” setup node in the BIOS setup menu to determine the temperature threshold at which the system shuts down.
The Automatic Critical Trip Point BIOS setting shuts down the system at 5
°
C above the maximum specified temperature of the processor
7.5
ACPI Suspend Modes and Resume Events
The conga-TS570 BIOS supports S3 (Suspend to RAM), S4 (Suspend to Disk), and S5 (Soft-Off).
Table 10 Wake Events
The table below lists the events that wake the system from S3-S5.
Wake Event
Conditions/Remarks
Power Button
Wakes unconditionally from S3-S5
Onboard LAN Event
Device driver must be configured for Wake On LAN support
SMBALERT#
Wakes unconditionally from S3-S5
PCI Express WAKE#
Wakes unconditionally from S3-S5
WAKE#
Wakes unconditionally from S3
PME#
Activate the wake up capabilities of a PCI device using Windows Device Manager configuration options for this device or set Resume On
PME# to “Enabled” in the power setup menu.