Power Management - Lenovo 3000 C100 Hardware Maintenance Manual

Related service information

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 ThinkVantage button and 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
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 Advanced Power Management (APM) and Advanced Configuration
and Power Interface (ACPI) 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:
v The ring indicator (RI) is signaled by a serial device or a PC Card device.
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Fn+F4.
operation with the keyboard, 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.)