Intel D845PEBT2 Product Specification - Page 38
Table 6., Effects of Pressing the Power Switch
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Intel Desktop Board D845PEBT2 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 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 Off (ACPI S5 - Soft off) Less than four seconds On (ACPI S0 - working state) Less than four seconds On (ACPI S0 - working state) More than four seconds Sleep (ACPI S1 or S3 - sleeping state) Less than four seconds Sleep (ACPI S1 or S3 - sleeping state) More than four seconds ...the system enters this state Power-on (ACPI S0 - working state) Soft-off/Standby (ACPI S1 or S3 - sleeping state) Fail safe power-off (ACPI S5 - Soft off) Wake-up (ACPI S0 - working state) Power-off (ACPI S5 - Soft off) For information about The Desktop Board D845PEBT2's compliance level with ACPI Refer to Section 1.4, page 17 38