Intel Desktop Board D845PEBT2 Technical Product Specification
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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 the Desktop Board D845PEBT2 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 standby or 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 40)
• 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 S5 – Soft off)
Less than four seconds Power-on
(ACPI S0 – working state)
On
(ACPI S0 – working state)
Less than four seconds Soft-off/Standby
(ACPI S1 or S3 – sleeping state)
On
(ACPI S0 – working state)
More than four seconds Fail safe power-off
(ACPI S5 – Soft off)
Sleep
(ACPI S1 or S3 – sleeping state)
Less than four seconds Wake-up
(ACPI S0 – working state)
Sleep
(ACPI S1 or S3 – sleeping state)
More than four seconds Power-off
(ACPI S5 – Soft off)
For information about Refer to
The Desktop Board D845PEBT2's compliance level with ACPI Section 1.4, page 17
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