Intel D850MVSE - Effects of Pressing the Power Switch

Product Description
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1.14.1.2 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 D850MD and D850MV boards requires an
operating system that provides full ACPI support. ACPI features include:
• Plug and Play (including bus and device enumeration) and APM support (normally contained
in the BIOS).
• 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 11 on page 41).
• Support for a front panel power and sleep mode switch. Table 9 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 9. 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 – sleeping state)
On
(ACPI S0 – working state)
More than four seconds Fail-safe power-off
(ACPI S5 – soft-off)
Sleep
(ACPI S1 – sleeping state)
Less than four seconds Wake-up
(ACPI S0 – working state)
Sleep
(ACPI S1 – sleeping state)
More than four seconds Power-off
(ACPI S5 – soft-off)
For information about Refer to
The D850MD and D850MV boards’ compliance level with ACPI Section 1.5, page 19