Intel BONANZA S478 I875 ATX DDR BLKD875PBZLK User Manual

  

41 

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 D875PBZ 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 10 on page 43) 
•  Support for a front panel power and sleep mode switch 
Table 8 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 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 or S3 – sleeping state) 

On 
(ACPI S0 – working state) 

More than four seconds 

Fail safe power-off 
(ACPI S5 – Soft off) 

Sleep 
(ACPI S1 or S3 – sleeping state) 

Less than four seconds 

Wake-up 
(ACPI S0 – working state) 

Sleep  
(ACPI S1 or S3 – sleeping state) 

More than four seconds 

Power-off 
(ACPI S5 – Soft off) 

 

The Desktop Board D875PBZ's compliance level with ACPI 

Section 1.4, page 17