Power Management Features (TP 570 - 2644)
Power Management Features
Three power management modes are provided by the computer to reduce power consumption and prolong
Standby mode: In standby mode, the following occurs:
- The LCD backlight turns off.
- The hard disk drive motor stops.
- The speaker is muted.
Note: Standby mode in Windows 98 is called suspend mode in Windows 95.
The computer enters standby mode when the Fn + F3 keys are pressed.
The computer exits standby and resumes normal operation when any key is pressed.
Suspend mode: When the computer enters suspend mode, the following events occur in addition to what occurs
in standby mode:
- The LCD is powered off.
- The hard disk drive is powered off.
- The CPU stops.
Note: Suspend mode in Windows 95 is called standby mode in Windows 98.
Any of the following events causes the computer to enter suspend mode:
- The Fn + F4 keys are pressed.
- The LCD cover is closed. If you select the Will not suspend even if LCD is closed
check box in the Power Management Properties window, the computer will not enter suspend mode even if the LCD is
closed, the LCD only turns off.
- The Suspend button is selected in the Fuel-Gauge program.
- The specified time has elapsed from the last operation with the keyboard, the TrackPoint, the hard
disk drive, the parallel connector, or the diskette drive, or the AC Adapter is plugged in.
In Windows 95, the timer is set by the Suspend Timer selection in the Power Properties window.
In Windows 98, the timer is set by the System standby timer selection in the 'Power Management Properties' window.
- The battery indicator blinks orange, indicating that the battery power is low. If you select Hibernate when
battery becomes low check box in the 'Power Management Properties' window, the computer enters hibernation mode
under this condition.
Note: Even if you don't set the low-battery alarm, the charge indicator lets you know
that the battery is low, and then the ThinkPad automatically enters the power-saving mode.
This default low-battery behavior is independent of the operating system, so the computer might
behave differently from your setting if you set the low-battery alarm.
The computer chooses appropriately between your setting and the default setting.
Any one of the following events causes the computer to resume operation from suspend mode:
- The Fn key is pressed.
- The LCD cover is opened.
- The ring indicator (RI) is signaled by a serial device or PC Card device.
- The power switch is turned on.
- The resume timer is set. In Windows 95, you can set the time with the Resume on timer selection in the
'Power Management Properties' window.
In Windows 98, the Scheduled Tasks setting has priority over the Resume on timer selection in the
'Power Management Properties' window.
Note: The computer does not accept any event immediately after it enters
Therefore, wait a few seconds before taking any action to reenter operation mode.
For the Windows NT User A Windows NT user cannot create a hibernation file in
a Windows NT system that uses the NTFS format system, the Windows NT default format.
If you want to use hibernation mode, you should reinstall Windows NT with a FAT format system.
In hibernation mode, the following occurs:
- The system status, RAM, VRAM, and setup data are stored on the hard disk.
- The system is powered off.
- In the ThinkPad Configuration program, the computer can be set to suspend/hibernate while docked.
- The computer cannot enter hibernation mode when it is powered with ac power and a communication
PC Card is used.
Any one of the following events causes the computer to enter hibernation mode:
- The Fn + F12 keys are pressed.
- The Hibernation button is selected in the Fuel-Gauge program.
- The power switch is turned off and hibernation mode is set to Power switch mode [Hibernation].
- The timer conditions are satisfied in suspend mode (for operating systems other than Windows 98).
- A critically low battery condition occurs and hibernation mode is set to Hibernate when battery
The computer exits hibernation mode and resumes operation when the power switch is pressed.
When power is turned on, the hibernation file in the boot record on the hard disk drive is read
and system status is restored from the hard disk drive.
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