Power management
To reduce power consumption, the computer has three power management modes:
screen blank, standby, and hibernation.
Screen blank mode
Screen blank mode has three variants, as follows:
1. If you press Fn+F3, or if the time set on the “LCD off timer” in the BIOS Setup
Utility expires,
v The LCD backlight turns off.
v The hard disk drive motor stops.
v The speaker is muted.
2. If you are using the Advanced Configuration and Power Interface (ACPI)
operating system and you press Fn+F3,
v The LCD backlight turns off.
v The hard disk drive motor stops.
3.
If the time set on the “Turn off monitor” timer in the operating system expires,
v The LCD backlight turns off.
To end screen blank mode and resume normal operation, press any key.
Standby mode
When the computer enters standby mode, the following events occur in addition to
what occurs in screen blank mode:
v The LCD is powered off.
v The hard disk drive is powered off.
v The CPU stops.
To enter standby mode, press Fn+F4.
Note: If you are using the ACPI operating system, you can change the action of
Fn+F4.
In certain circumstances, the computer goes into standby mode automatically:
v If a “suspend time” has been set on the timer, and the user does not do any
operation with the keyboard, the TrackPoint
®
, the hard disk, the parallel
connector, or the diskette drive within that time.
v If the battery indicator blinks orange, indicating that the battery power is low.
(Alternatively, if Hibernate when battery becomes low has been selected in the
“Power Management Properties” window, the computer goes into hibernation
mode.)
To cause the computer to return from standby mode and resume operation, do one
of the following:
v Press the Fn key.
v Open the LCD cover.
v Turn on the power switch.
Also, in either of the following events, the computer automatically returns from
standby mode and resumes operation:
v The ring indicator (RI) is signaled by a serial device or a PC Card device.
v The time set on the resume timer elapses.
Related service information
24 MT 2511, 2512, 2513, and 2514
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