Product Description

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

1.13.1ACPI

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…

Off

(ACPI G2/S5 state)

On

(ACPI G0 state)

On

(ACPI G0 state)

Sleep

(ACPI G1 state)

Sleep

(ACPI G1 state)

…and the power switch is pressed for

Less than four seconds

Less than four seconds

More than four seconds

Less than four seconds

More than four seconds

…the system enters this state

Power on

Soft off/Suspend

Fail safe power off

Wake up

Power off

For information about

Refer to

The board’s compliance level with ACPI

Section 1.3, page 13

 

 

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