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What is S3/Standby/Suspend to RAM and S4/Hibernate/Suspend to Disk?

S3/Standby is a "sleep state" (suspend to the system memory) that is supported by the systems hardware and certain operating systems. Once the system goes to sleep, it will "wake up" when the mouse is moved,any key is pressed on the keyboard or the power button is pressed .Auto Power-on & Shut-down can wake up the computer from standby or hibernation state at specified time. S4/Hibernate is a "sleep state" in which data is moved from system memory to the hard disk. This enables a system to 'wake' quickly while still helping to maintain data since you are not subject to power outages like you are when a system is in a screen saver mode, in S1 or in Standby (S3).

State	Description
S0/Working	System is on. The CPU is fully up and running; power conservation is on a per-device basis.
S1 Sleep	System appears off. The CPU is stopped; RAM is refreshed; the system is running in a low power mode.
S2 Sleep	System appears off. The CPU has no power; RAM is refreshed; the system is in a lower power mode than S1.
S3 Sleep (Standby)	System appears off. The CPU has no power; RAM is in slow refresh; the power supply is in a reduced power mode. This mode is also referred to as 'Save To RAM'.
S4 Hibernate	System appears off. The hardware is completely off, but system memory has been saved as a temporary file onto the harddisk. This mode is also referred to as 'Save To Disk'.
S5/Off	System is off. The hardware is completely off, the operating system has shut down; nothing has been saved. Requires a complete reboot to return to the Working state.

Which operating systems support Standby (S3) and Hibernate (S4)?

S3 an S4 are supported by Microsoft Windows XP, Windows 2000, Windows Me and Windows 98SE. Windows 95 and Windows NT do not support S3/4.

Make your computer support s3 sleep mode

- In order to make your computer support s3 sleep (standby) mode you should:
To enter the CMOS Setup, you must press a certain key or combination of keys during the initial startup sequence. Most systems use "Esc," "Del," "F1," "F2," "Ctrl-Esc" or "Ctrl-Alt-Esc" to enter setup. There is usually a line of text at the bottom of the display that tells you "Press ___ to Enter Setup."

- Once you have entered setup, you will see a set of text screens with a number of options. Some of these are standard, while others vary according to the BIOS manufacturer.
In the following window, use arrow keys to move among the items, what we need to select is Power Management Setup .

Standard CMOS Features

Advanced BIOS Features

Advanced chipset Features

Integrated peripherals

Power Management Setup

PnP/PcI configurations

PC Health status

seepu setup

Load Fail-safe Defaults

Load optimized Defaults

set supervisor password

set user password

save & Exit setup

Exit without saving

Esc: Quit

F10: save & Exit setup :select Item

Time,Date,Hard Disk Type...

- Select the Power Management Setup and press <Enter> and the following sub-menu will be appeared. In the following window, set up ACPI Suspend Type option as S3(STR).

Power Management Setup

ACPI Function Enabled

ACPI Suspend Type S3(STR)

Power Mangment User Define

Video off Method DPMS

Video off In Suspend Yes

Suspend Type stop Grant

MODEM Use IRQ 3

Suspend Mode Disabled

HDD Power Down Disabled

Soft-Off by PWR-BTTN Instant-Off

Wake-Up By PCI card Disabled

Power On by Ring Disabled

Wake Up On LAN Disabled

USB KB Wake-Up Drom S3 Disabled

Resume by Alarm Enabled

Date( of Month ) Alarm 0

Time (hh: mm: ss) Alarm 7 30 0

Primary IDE 0 Disabled

Primary IDE 1 Disabled

Secondary IDE 0 Disabled

Secondary IDE 1 Disabled

FDD COM LPT Port Disabled

PCI PIRQ[A-D]# Disabled

** Reload Global Timer Events **

Item Help

Menu Level

- When you are finished what your changes, you should choose "Save & Exit setup" or press F10 to exit. By doing so, the settings will come into effect next time when you power on the system again.

SAVE to CMOS and EXIT (Y/N)? Y

- When your computer is sleeped in s3 mode , you can press the power button on the panel of mainframe to wake up your computer . Of course , Auto Power-on & Shut-down can wake up your computer too . When a scheduled powr-on task is time up , Auto Power-on & Shut-down should wake up your computer from s3 mode.