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1.13 Power Management Features
Power management is implemented at several levels, including:
• Advanced Configuration and Power Interface (ACPI)
• Hardware support:
Power connector
Wake on network event
Instantly Available technology
Wake on Ring
Resume on Ring
1.13.1 ACPI
If the board is used with an ACPI-aware operating system, the BIOS can provide ACPI support.
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 board requires the support of an operating
system that provides full ACPI functionality. 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 30-watt system operation in the Power On Suspend sleeping
state, and less than 5-watt system operation in the Suspend to RAM sleeping state
• A Soft-off feature that enables the operating system to power off the computer
• Support for multiple wake up events (see Table 9 on page 29)
• 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
Off (ACPI G2/S5 state) Less than four seconds Power on
On (ACPI G0 state) Less than four seconds Soft off/Suspend
On (ACPI G0 state) More than four seconds Fail safe power off
Sleep (ACPI G1 state) Less than four seconds Wake up
Sleep (ACPI G1 state) More than four seconds Power off
For information about Refer to
The board’s compliance level with ACPI Section 1.3, page 13