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IBM-AUSTRIA - PC-HW-Support 30 Aug 1999 |
Power Management Features (2640-560x - 60x, 70x)
Power Management Features
Three power management modes are provided by the
computer to reduce power
consumption and prolong battery power.
Standby Mode
In standby mode the following occurs:
- The LCD backlight turns off.
- The hard disk motor stops.
Events that cause the computer to enter standby mode:
- Standby requested by the Fn key. (Fn+F3)
- There has been activity under auto-standby in the ThinkPad Configurations program.
The computer exits standby and resumes operation when any key is pressed.
Suspend Mode
In suspend mode, the following occurs, in addition to what occurs
in standby mode:
- The LCD is powered-off.
- The hard disk is powered-off.
- The CPU stops.
Events that cause the computer to enter suspend mode:
- Suspend mode is requested by the Fn key (Fn+F4).
- The LCD is closed.
- The specified time has elapsed from the last operation with
the keyboard, TrackPoint III, the hard disk drive, the parallel connector, or the
diskette drive, or the AC Adapter is plugged in.
The time is specified by Suspend Timer
in the ThinkPad Configurations program.
- The battery condition is low. The battery power indicator
blinks orange.
- Either the PS2 OFF or PS2 Suspend command is set in
the ThinkPad Features program.
NOTE:
- In the ThinkPad Configurations program, the computer can be set to
Will not suspend even if LCD is closed
- If the computer is powered on with ac power and it is used with one of the communication PC Cards,
the computer enters standby mode , the PC Card and application program remain active.
- The computer cannot enter suspend mode while a communication link is connecting.
The following events cause the computer to resume from suspend mode:
- The LCD is opened.
- The Real Time Clock (RTC) alarm is signaled.
- The Ring Indicator (RI) is signaled by a serial or PC Card device
- The Fn key is pressed.
- An external keyboard key is pressed while the computer is operating with ac power.
The computer also exits suspend mode when timer conditions are satisfied for
entering hibernation mode.
Hibernation Mode
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.
NOTE:
The computer cannot enter hibernation mode if it has been
powered on with ac power and a communication PC card is used.
The following events cause the computer to enter hibernation mode:
- Hibernation mode is requested by the Fn
key (Fn+F12).
- Timer conditions are satisfied in suspend mode.
- A critical low battery condition occurs.
- The PS2 HIBernation command is set in the ThinkPad Configurations program.
The computer exits hibernation mode and resumes operation when the power-on 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.
Port Replicator Power Overload
If a power shutdown occurs intermittently when PC Card devices are used with a port replicator, suspect an over-current
problem. Some PC Card devices use more power, if the maximum usage of each device occurs simultaneously, the total
current will exceed the limit, thereby causing a power shutdown. Isolate this problem by removing one of the devices,
and use the computer under the same condition, to see if a power shutdown occurs. Do this procedure for all
devices to help determine the cause.
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