2 Operating on battery power
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Power management modes

Sleep mode

Power management functions ar e handl ed b y the ACPI-aware operating system. In
this set-up, you do not need to set timeout values for devices before they enter a
power saving mode.
Sleep mode may be one of three computer power saving modes: standby,
hibernation or power off. Wi ndows determines which of these modes to enter in.
To enter Sleep mode:
• Press the Sleep hot key Fn-F4.
• Idle times for devices and the computer determined by Windows 98 elaps es
Exiting sleep mode depends on which power saving mode the computer is
currently in.

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 a number of ways to en te r S tandby mode:
• If the waiting time specified by the System Standby value or the operating
system elapses without any syste m 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
• When customized functions for pow er m anagem ent are set t o Sta ndb y and the
corresponding action is taken. See “Setting advanced features in power
management” on page 86 for more information.
• Invoked by the operating system power-saving modes
Note: If your computer is running Windows NT 4.0 or Windows 95, Fn-F4
acts as the standby hot key.
The following signals indicate that the computer is in Standby mode:
• The buzzer beeps
• The Sleep indicator lights