Power Management Modes

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, the display shuts off until you press a key or move the touchpad or external mouse.

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 to the computer, it automatically adjusts the LCD backlight to a brighter level.

The hard disk enters standby mode when there are no disk read/write operations within the period specified. 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.

The computer consumes very low power in Standby mode. Data remain intact in the system memory until the battery is drained.

There are five ways to enter Standby mode:

• Pressing the Standby hot key Fn-F3
• If the waiting time specified elapses without any system activity
• Closing the display cover
• When the computer is about to enter Hibernation mode (e.g., during a battery-low condition, but the Hibernation file is invalid or not present
• Invoked by the operating system

Note: If the computer beeps but does not enter Standby mode after pressing the Standby hot key, it means the operating system will not allow the computer to enter the power saving mode.

The following signals indicate that the computer is in Standby mode:

• The buzzer beeps
• The Standby indicator lights

Warning! Unstored data is lost when you turn off the computer while it is in standby mode or when the battery is drained.

To leave Standby mode and return to normal mode:

• Press any key
• Move the active pointing device (internal or external, PS/2 or serial)
• Have the resume timer set and let it be matched
• Open the display cover
• Experience an incoming PC card modem event with Resume on Modem Ring enabled

In Hibernation mode, all power shuts off (the computer does not consume any power). The computer saves all system information onto the hard disk before it enters Hibernation mode. Once you turn on the power, the computer restores this information and resumes where you left off upon leaving Hibernation mode.

There is one necessary condition for the computer to enter Hibernation mode:

• The Hibernation file created by PHDISK must be present and valid.

In this situation, there are four ways to enter Hibernation mode:

• Pressing the Hibernation hot key Fn-F4
• If the waiting time specified elapses without any system activity
• If a battery low condition occurs and the Battery Low Suspend parameter in Setup is set to [ENABLED].
• Invoked by the operating system power saving modes

Note: If the computer beeps but does not enter Hibernation mode after pressing the Hibernation hot key, it means the operating system will not allow the computer to enter the power saving mode.

To exit Hibernation mode, press the power switch. The computer also resumes from Hibernation mode if the resume timer is set and matched, or via LAN if the Remote on LAN access parameter is enabled in Setup Utility.

Warning! Do not change any devices (such as add memory or swap hard disks when the computer is in Hibernation mode.