Product Description
29
1.14 Power Management
Power management is implemented at several levels, including:
• Software support through Advanced Configuration and Power Interface (ACPI)
• Hardware support:
― Power Input
― Instantly Available PC technology
― LAN wake capabilities
― Wake from USB
― WAKE# signal wake-up support
― Wake from S5
― Wake from CIR
1.14.1 ACPI
ACPI gives the operating system direct control over the power management and Plug and Play
functions of a computer. The use of ACPI with this kit requires an operating system that provides
full ACPI support. ACPI features include:
• Plug and Play (including bus and device enumeration)
• Power management control of individual devices, add-in boards (some add-in boards may
require an ACPI-aware driver), video displays, and hard disk drives
• Methods for achieving less than 15-watt system operation in the power-on/standby
sleeping state
• A Soft-off feature that enables the operating system to power-off the kit
• Support for multiple wake-up events (see Table 9 on page 31)
• Support for a front panel power and sleep mode switch
Table 7 lists the system states based on how long the power switch is pressed, depending on how
ACPI is configured with an ACPI-aware operating system.
Table 7. Effects of Pressing the Power Switch
If the system is in this state… …and the power switch is pressed for …the system enters this state
(ACPI G2/G5 – Soft off)
(ACPI G0 – working state)
On
(ACPI G0 – working state)
Less than four seconds
Soft-off/Standby
(ACPI G1 – sleeping state)
Note
(ACPI G0 – working state)
More than six seconds
(ACPI G2/G5 – Soft off)
(ACPI G1 – sleeping state)
(ACPI G0 – working state)
(ACPI G1 – sleeping state)
(ACPI G2/G5 – Soft off)
Note: Depending on power management settings in the operating system.
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