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).
|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.|
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.
- 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 .
setup utility-copyright(c)1984-2001 Award software
Standard CMOS Features
Advanced BIOS Features
Advanced chipset Features
Load Fail-safe Defaults
Load optimized Defaults
set supervisor password
set user password
save & Exit setup
Exit without saving
save & Exit setup
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).
ACPI Suspend Type
off In Suspend
MODEM Use IRQ 3
HDD Power Down Disabled
Soft-Off by PWR-BTTN
By PCI card
On by Ring
Wake-Up Drom S3
of Month ) Alarm
(hh: mm: ss) Alarm
Secondary IDE 0
Secondary IDE 1
** Reload Global Timer
- 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.
- 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.