There are 6 different modes. S0 S1 S2 S3 S4 S5 S0- Working S1-: All processor caches are flushed, and the CPU(s) stop executing instructions. Power to the CPU(s) and RAM is maintained; devices that do not indicate they must remain on may be powered down. S2- The CPU is powered off. S3- Commonly referred to Standy By or Sleep. The RAM is still powered. S4- Hibernation. All content of main memory is saved to non-volatile memory such as hard drive, and is powered on. S5- Soft Off-- G2, S5, and Soft Off are synonyms. G2 is almost the same as G3 Mechanical Off, but some components remain powered so the computer can "wake" from input from the keyboard, clock, modem, LAN, or USB device.
ACPI
ACPI Function
ACPI is a function of the hardware and the BIOS. Most Pentium II motherboards do have ACPI, but you cannot add ACPI to a system that does not. If you cannot get ACPI to work, check to see if it is enabled in the BIOS.
ACPI S3 mode
Green Star is a corporation. ACPI is a standard.
With ACPI the operating system controls power management.
ACPI is the successor APMOperating System
APM (Advanced Power Management).
ACPI stands for Advanced Configuration and Power Interface. ACPI provides a standard for configuring devices and managing power for the operating system.
ACPI was initally developed by Intel, Microsoft, and Toshiba. Current developers of ACPI include Phoenix, Dell, and Hewlett-Packard.
An ACPI processor helps the computer recognized motherboard, hardware and drivers. It just replaces the old AMP standard.
Replace the original HAL.