INS8145A ATX MB User’s Manual V1.1
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ACPI Sleep State
The Advanced Configuration and Power Interface (ACPI) specification provides an open standard
for device configuration and power management by the operating system.
ACPI defines platform-independent interfaces for hardware discovery, configuration, power
management and monitoring. Power Management settings are configurable.
The menu displays the highest ACPI sleep state when the system enters suspend. The following
ACPI sleep p states are available:
G0 (S0): Working
G1, Sleeping (four states S1 through S4):
o
S1: All processor caches are flushed and the CPU(s) stops executing instructions.
Power to the CPU(s) and RAM is maintained; devices that do not indicate they must
remain on may be powered down.
o
S2: CPU powered off
o
S3: Commonly referred to as Standby, Sleep, or Suspend to RAM. RAM remains
powered
o
S4: Hibernation or Suspend to Disk. All content of main memory is saved to
non-volatile memory such as a hard drive, and is powered down.
G2 (S5), Soft Off: G2 is similar to G3 Mechanical Off setting, but some components
remain powered so the computer can "wake" from designated keyboard, clock, modem,
LAN, or USB device input.
G3, Mechanical Off (Default): The computer's power consumption approaches close to zero
to the point that the power cord can be removed and the system is safe for disassembly
(typically, only the real-time clock is running off its own small battery).
A Legacy state is also defined for operating systems not supporting ACPI functionality. ACPI is
disabled in this state.
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