JHL90 Service Manual
6. ACPI (Advanced Configuration and Power
Interface)
6.1 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.
6.2 ACPI Sleep Status
BIOS must support the following sleep states - S3, S4 and S5.
6.3 Fast Resume
BIOS must hands off the control to the operating system within the following
time limits:
Required
S3->S0 2 seconds
*Measured using the Microsoft BootVis tool.
In addition, total resume time from S3 must be completed within 5 seconds.
6.4 Power State Transition Diagram
The state transition diagram in ACPI mode is as follows:
From (State) Leave By Condition Enter (State)
Power Button
On board LAN
Any key
Alarm
S3
Critical low battery (Only in DC mode)
S0
Power Button
On board LAN (Only in AC mode)
S4
RTC (Only in AC mode)
S0
S5 Power Button S0
Press Lid switch (depends on ACPI OS setting)
Standby icon in shutdown menu in Windows.
S0
ACPI OS timer expired
S3
2-9
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