Product Description
1.10 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 from S5
+5 V Standby Power Indicator LED
1.10.1ACPI
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 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,
•Methods for achieving less than
•A
•Support for multiple
•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
Table 7. Effects of Pressing the Power Switch
If the system is in this | …and the power switch is |
|
state… | pressed for | …the system enters this state |
Off | Less than four seconds | |
(ACPI G2/G5 – Soft off) |
| (ACPI G0 – working state) |
On | Less than four seconds | |
(ACPI G0 – working state) |
| (ACPI G1 – sleeping state) Note |
On | More than six seconds | Fail safe |
(ACPI G0 – working state) |
| (ACPI G2/G5 – Soft off) |
Sleep | Less than four seconds | |
(ACPI G1 – sleeping state) |
| (ACPI G0 – working state) |
Sleep | More than six seconds | |
(ACPI G1 – sleeping state) |
| (ACPI G2/G5 – Soft off) |
Note: Depending on power management settings in the operating system.
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