Related service information

Power management

To reduce power consumption, the computer has three power management modes: screen blank, standby, and hibernation.

Notes

vScreen blank mode is called standby mode in Windows 95 and Windows NT.

vStandby mode is called suspend mode in Windows 95 and Windows NT.

Screen blank mode

Screen blank mode has three variants, as follows:

1.If you press Fn + F3, or the time set on the “LCD off

timer” in IBM BIOS Setup Utility expires, v The LCD backlight turns off.

vThe hard-disk drive motor stops.

vThe speaker is muted.

2.If you are using the ACPI operating system and you press Fn + F3,

vThe LCD backlight turns off.

vThe hard-disk drive motor stops.

3.If the time set on the “Turn off monitor” timer in the operating system expires,

vThe 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:

vThe LCD is powered off.

vThe hard-disk drive is powered off.

vThe CPU stops.

To enter standby mode, press Fn + F4.

Note: You can change the action of Fn + F4, if you are using the ACPI operating system.

In certain circumstances, the computer goes into standby mode automatically:

vIf 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.

30ThinkPad A20m/p, A21m/p, A22m/p

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IBM A21M, A22P, A22M, A21P, A20M, MT 2631 manual Power management, Screen blank mode, Standby mode