Power Management; Screen Blank Mode; Standby Mode - IBM ThinkPad R40 Hardware Maintenance Manual

Power management

To reduce power consumption, the com puter has three
power m anagem ent modes: screen blank, standby, and
hibernation.
N otes
• Screen blank mode is called standby m ode in
W indows 95 and W indows NT.
• Standby mode is called suspend m ode in
W indows 95 and W indows 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
tim er" in IBM BIOS Setup Utility expires,
• The LCD backlight turns off.
• The hard-disk drive m otor stops.
• The speaker is muted.
2. If you are using the ACPI operating system and you
press Fn+F3,
• The LCD backlight turns off.
• The hard-disk drive m otor stops.
3. If the time set on the "Turn off m onitor" tim er in the
operating system expires,
• The LCD backlight turns off.
To end screen blank mode and resume normal operation,
press any key.

Standby mode

W hen the com puter enters standby mode, the following
events occur in addition to what occurs in screen blank
mode:
• The LCD is powered off.
• The hard-disk drive is powered off.
• The CPU stops.
To enter standby mode, press Fn+F4.
N ote: You can change the action of Fn+F4, if you are
using the ACPI operating system.
In certain circumstances, the com puter goes into standby
mode autom atically:
• If a "suspend tim e" 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.
Related service information
General descriptions 3 3