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Vig390s Motherboard Manual V1.0
26
Power Management
Power management is implemented at several levels, including:
• Software support through Advanced Configuration and Power Interface (ACPI)
• Hardware support:
o Power connector
o Fan connectors
o LAN wake capabilities
o Instantly Available PC technology
o Resume on Ring
o Wake from USB
o Wake from PS/2 devices
o Power Management Event signal (PME#) wake-up support
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 the VIG390S
motherboard 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
• Support for a front panel power and sleep mode switch
Table 9 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 9: 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 that four seconds Power-on
(ACPI G0 – working)
On
(ACPI G0 – working state)
Less than four seconds Soft off/Standby
(ACPI G1 – sleeping state)
On
(ACPI G0 – working state)
More than four seconds Fail safe power-off
(ACPI G2/G5 – soft-off)
Sleep
(ACPI G1 – sleeping state)
Less that four seconds Wake-up
(ACPI G0 – working state)
Sleep
(ACPI G1 – sleeping state)
More than fore seconds Power-off
(ACPI G2/G5 – Soft off)