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How to exit Sleep mode depends upon which power-saving mode the computer is
in.
Display standby mode
Screen activity is determined by the keyboard, the built-in touchpad, and an
external PS/2 pointing device. If these devices are idle for the period specified by
the LCD backlight Timeout value, the display shuts off until you press a key or
move the touchpad or external mouse.

"Automatic dim" feature

The computer has a unique "automatic dim" power-saving feature. When the
computer is using AC power and you disconnect the AC adapter from the
computer, it automatically dims the LCD backlight to save power. If you
reconnect AC power t o the computer, it automatic ally adjusts the LCD backlight to
a brighter level.
Hard disk standby mode
The hard disk enters standby mode when there are no disk read/write operations
within the period of time determined by t he power manageme nt system. In this
state, the power supplied to the hard disk is reduced to a minimum. The hard disk
returns to normal once the computer accesses it.
Standby mode
The computer consumes very low power in Standby mode. Data remains intact in
the system memory until the battery is drained.
There are four ways to enter Standby mode:
• Pressing the Sleep hotkey Fn-F4
• If the waiting time specified by the S tandby Timeout value or the operating
system elapses without any system activity
• Closing the display cover
• When the computer is about to enter H ibernation mode (e.g., during a battery
low condition), but the Hibernation file is invalid or not present
Note: If the computer does not enter Standby mode after pressi ng the Sleep
hotkey, it means the operating system wil l not al low t he co mputer t o enter t he
power-saving mode.