Intel D845PEBT2 Product Guide - Page 19

Power Management Features, ACPI, Suspend to RAM (Instantly Available PC Technology)

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Desktop Board Features • If both the supervisor and user passwords are set, you must enter either the supervisor password or the user password to access Setup. Setup options are then available for viewing and changing depending on whether the supervisor or user password was entered. • Setting a user password restricts who can boot the computer. The password prompt is displayed before the computer is booted. If only the supervisor password is set, the computer boots without asking for a password. If both passwords are set, you can enter either password to boot the computer. Power Management Features Power management is implemented at several levels, including: • Advanced Configuration and Power Interface (ACPI) • Suspend to RAM (Instantly Available PC technology) ACPI ACPI gives the operating system direct control over the power management and Plug & Play functions of a computer. The use of ACPI with Desktop Board D845PEBT2 requires an operating system that provides full ACPI support. Suspend to RAM (Instantly Available PC Technology) CAUTION For Instantly Available PC technology, the 5 V standby line for the power supply must be capable of delivering adequate +5 V standby current. Failure to provide adequate standby current when using this feature can damage the power supply and/or effect ACPI S3 sleep state functionality. Instantly Available technology enables the board to enter the ACPI S3 (Suspend-to-RAM) sleep state. While in the S3 sleep state, the computer will appear to be off. When signaled by a wake-up device or event, the system quickly returns to its last known awake state. The desktop board's standby power indicator, shown in Figure 2, is lit when there is standby power to the system. This includes the memory modules and PCI bus connectors, even when the computer appears to be off. If the system has a dual-colored power LED on the front panel, the sleep state is indicated by the LED turning amber. 19

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Desktop Board Features
19
•
If both the supervisor and user passwords are set, you must enter either the supervisor
password or the user password to access Setup.
Setup options are then available for viewing
and changing depending on whether the supervisor or user password was entered.
•
Setting a user password restricts who can boot the computer.
The password prompt is
displayed before the computer is booted.
If only the supervisor password is set, the computer
boots without asking for a password.
If both passwords are set, you can enter either password
to boot the computer.
Power Management Features
Power management is implemented at several levels, including:
•
Advanced Configuration and Power Interface (ACPI)
•
Suspend to RAM (Instantly Available PC technology)
ACPI
ACPI gives the operating system direct control over the power management and Plug & Play
functions of a computer.
The use of ACPI with Desktop Board D845PEBT2 requires an operating
system that provides full ACPI support.
Suspend to RAM (Instantly Available PC Technology)
CAUTION
For Instantly Available PC technology, the 5 V standby line for the power supply must be capable
of delivering adequate +5 V standby current.
Failure to provide adequate standby current when
using this feature can damage the power supply and/or effect ACPI S3 sleep state functionality.
Instantly Available technology enables the board to enter the ACPI S3 (Suspend-to-RAM) sleep
state.
While in the S3 sleep state, the computer will appear to be off.
When signaled by a wake-up
device or event, the system quickly returns to its last known awake state.
The desktop board
’
s standby power indicator, shown in Figure 2, is lit when there is standby power
to the system.
This includes the memory modules and PCI bus connectors, even when the
computer appears to be off.
If the system has a dual-colored power LED on the front panel, the sleep state is indicated by the
LED turning amber.