Intel D2550MUD2 Technical product specification - Page 30
Power Management - video driver
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Intel Desktop Board D2550MUD2 Technical Product Specification 1.11 Power Management Power management is implemented at several levels, including: • Software support through Advanced Configuration and Power Interface (ACPI) • Hardware support: Power connector Fan header LAN wake capabilities Instantly Available PC technology Wake from USB Wake from PS/2 devices Power Management Event signal (PME#) wake-up support WAKE# signal wake-up support 1.11.1 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 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 8 on page 32) • 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 G2/G5 - Soft off) Less than four seconds On (ACPI G0 - working state) Less than four seconds On (ACPI G0 - working state) More than four seconds Sleep (ACPI G1 - sleeping state) Less than four seconds Sleep (ACPI G1 - sleeping state) More than four seconds ...the system enters this state Power-on (ACPI G0 - working state) Power-off (ACPI G2/G5 - Soft off) Fail safe power-off (ACPI G2/G5 - Soft off) Wake-up (ACPI G0 - working state) Power-off (ACPI G2/G5 - Soft off) 30