4.7 ACPI (Advanced Configuration and Power Interface)
4.7.1 Introduction
The Advanced Configuration and Power Interface (ACPI) is a well-specified power
management and configuration mechanism. It evolves the existing collection of
power management codes, APM, PnP BIOS, and Etc.
4.7.2 ACPI Sleep Status
BIOS must support the following sleep states – S3, S4 and S5.
4.7.3 Fast Resume
BIOS must hands off the control to the operating system within the following time
limits:
Required
S3->S0
2seconds
*Measured using the Microsoft VTS (Velocity) tool.
In addition, total resume time from S3 must be completed within 5 seconds.
4.7.4 Power State Transition Diagram
The state transition diagram in ACPI mode is as follows:
From (State)
Leave By Condition
Enter (State)
Power Button
Internal Keyboard
RTC Alarm
On board LAN (WOL)(*1)
S3
If close lid, On board LAN (WOL)(*1)
S0
Battery Critical Hibernation trip point reached (*2)
S3
The timer timeout after the inactivity of selected timer in
power scheme, System Hibernate, reaches the setting
(*2)
S4
Power Button
On board LAN (Only in AC mode)
RTC Alarm(Only in AC mode)
S4
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