Power Management Features (2640)

^{IBM-AUSTRIA - PC-HW-Support 30 Aug 1999}

Power Management Features (2640)

Power Management Features

Three power management modes are provided by the computer to reduce power consumption and prolong battery power.

Standby Mode

When in standby mode the following occurs:

The LCD backlight turns off.
The hard disk motor stops.

Events that cause entering of standby mode:

Standby requested by the Fn key. (Fn+F3)
No activity under auto-standby enabled by the feature utility.

Events that cause the computer exit or resume standby mode:

(Resume) Any key operation.

Suspend Mode

When in suspend mode, the following, in addition to the four actions of standby mode, occur:

The LCD power is powered-off.
The hard disk is powered-off.
The CPU is stopped.

NOTE:

In the ThinkPad Features Program, the computer can be set to 'Will not suspend even if LCD is closed'..
When the computer is powered with ac power and 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 the suspend mode.
While a communication link is running.

Events that cause entering of 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, mouse, hard disk drive, parallel connector, diskette drive, or the AC Adapter is plugged in. The time is specified by Suspend Timer in the ThinkPad Features 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.

Events that cause exiting or resuming of suspend mode:

(Resume) The LCD is opened.
(Resume) Real time clock alarm signaled.
(Resume) Ring indicator (RI) is signaled by a serial or PCMCIA device
(Resume) The Fn key is pressed.
(Resume) An external keyboard key is pressed while operating with ac power.
(Exit) Timer conditions are satisfied to enter hibernation mode.

Hibernation Mode

When 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 when:
the computer is powered with ac power and a communication PC card is used.

Events that cause entering of hibernation mode:

The 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 Features program.

Event that causes the computer to exit hibernation mode.

The power-on switch is operated.

When power is turned on, the hibernation history of the boot record on the hard disk is recognized and system status is restored from the hard disk to resume operation.

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