Power Management; Screen Blank Mode; Standby Mode - Lenovo ThinkPad T400 Maintenance Manual
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Also See for ThinkPad T400:
- Hardware maintenance manual (386 pages) ,
- Service and troubleshooting manual (134 pages) ,
- Deployment manual (40 pages)
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Power management
To reduce power consumption, the computer has three power management modes:
screen blank, standby, and hibernation.
Screen blank mode
If the time set on the "Turn off monitor" timer in the operating system expires, the
LCD backlight turns off.
To put the computer into screen blank mode, press the ThinkVantage
use the ThinkVantage Productivity Center.
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
v If the battery indicator blinks orange, indicating that the battery power is low.
Note for the APM operating system: Even if you do not set the low-battery alarm,
the charge indicator notifies you when the battery is low, and then the computer
enters the power-saving mode automatically. This default low-battery behavior is
independent of the operating system; so if you have set the low-battery alarm, the
computer may not do what you specified. It chooses either your setting or the
default setting, whichever is appropriate.
If you are using the ACPI operating system, only the low-battery alarm is
available.
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:
operation with the keyboard, the TrackPoint, the hard disk, the parallel
connector, or the diskette drive within that time.
(Alternatively, if Hibernate when battery becomes low has been selected in the
"Power Management Properties" window, the computer goes into hibernation
mode.)
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