Product Description
31
1.16
Power Management
Power management is implemented at several levels, including:
•
Software support through Advanced Configuration and Power Interface (ACPI)
•
Hardware support:
⎯
Power connector
⎯
Fan headers
⎯
LAN wake capabilities
⎯
Instantly Available PC technology
⎯
Wake from USB
⎯
Power Management Event signal (PME#) wake-up support
⎯
PCI Express WAKE# signal support
⎯
Wake from serial port
⎯
Wake from PS/2
1.16.1
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 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, 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 computer
•
Support for multiple wake-up events (see Table 8 on page 33)
•
Support for a front panel power and sleep mode switch
Table 6 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 6. 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/G5 – Soft off)
Less than four seconds
Power-on
(ACPI G0 – working state)
On
(ACPI G0 – working state)
Less than four seconds
Soft-off/Standby (note)
(ACPI G1 – sleeping state)
On
(ACPI G0 – working state)
More than six seconds
Fail safe power-off
(ACPI G2/G5 – Soft off)
Sleep
(ACPI G1 – sleeping state)
Less than four seconds
Wake-up
(ACPI G0 – working state)
Sleep
(ACPI G1 – sleeping state)
More than six seconds
Power-off
(ACPI G2/G5 – Soft off)
Note: System can only enter Standby state if power switch action is properly configured by the
operating system.
