Intel D845GEBV2 BLKD845GERG2-10PK User Manual

 45 

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 Boards D845GEBV2 and 
D845GERG2 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 16 on page 47) 
•  Support for a front panel power and sleep mode switch   
Table 14 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. 

Off 
(ACPI G2/G5 – Soft off) 

Less than four seconds 

Power-on 
(ACPI G0 – working state) 

On 
(ACPI G0 – working state) 

Less than four seconds 

Soft-off/Standby 
(ACPI G1 – sleeping state) 

On 
(ACPI G0 – working state) 

More than four seconds 

Fail safe power-off 
(ACPI G2/G5 – Soft off) 

Sleep 
(ACPI G1 – sleeping state) 

Less than four seconds 

Wake-up 
(ACPI G0 – working state) 

Sleep  
(ACPI G1 – sleeping state) 

More than four seconds 

Power-off 
(ACPI G2/G5 – Soft off) 

 

The Desktop Boards’ compliance level with ACPI 

Section 1.5, page 20