Acpi; Effects Of Pressing The Power Switch - Intel BLKDQ67SW Technical Product Specification

Intel Desktop Board DQ67SW Technical Product Specification
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 7 on page 36)
• Support for a front panel power and sleep mode switch
Table 5 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 5. Effects of Pressing the Power Switch
If the system is in this
state...
Off
(ACPI G2/G5 – Soft off)
On
(ACPI G0 – working state)
On
(ACPI G0 – working state)
Sleep
(ACPI G1 – sleeping state)
Sleep
(ACPI G1 – sleeping state)
Note: System can only enter Standby state if power switch action is properly configured by the
operating system.
34
...and the power switch is
pressed for
Less than four seconds
Less than four seconds
More than six seconds
Less than four seconds
More than six seconds
...the system enters this state
Power-on
(ACPI G0 – working state)
Soft-off/Standby (note)
(ACPI G1 – sleeping state)
Fail safe power-off
(ACPI G2/G5 – Soft off)
Wake-up
(ACPI G0 – working state)
Power-off
(ACPI G2/G5 – Soft off)