Intel Desktop Board DX79TO Technical Product Specification
30
1.12 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
PME# signal wake-up support
WAKE# signal wake-up support
Wake from Consumer IR
Wake from S5
Power Supervisor
+5 V Standby Power Indicator LED
1.12.1 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
(refer to the Advanced Configuration and Power Interface Specification at
http://www.acpi.info/)
• Support for multiple wake-up events (see Table 9 on page 32)
• 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
…and the power switch is
…the system enters this state
Off
Less than four seconds Power-on
(ACPI G0 – working state)
On
(ACPI G0 – working state)
Less than four seconds Soft-off/Standby
(ACPI G1 – sleeping state)
On
(ACPI G0 – working state)
More than six seconds Fail safe power-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
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