Power Management Features (2625)

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

Power Management Features (2625)

Power Management Features

Five power management modes are provided by the computer to save 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.
The CPU clock is set to the lowest speed.

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 exiting or resuming of standby mode:

(Resume) Any key operation.
Ring wakeup if enabled.
Suspend Mode
When in suspend mode, the following, in addition to the four actions of standby mode, occur:
- The Audio is powered-off
- The CD-ROM is powered off.
- The LCD power is powered-off.
- The hard disk is powered-off.
- The CPU is stopped.

When the computer is powered with AC power and is used with one of the following IBM PC cards, the computer does not enter suspend or hibernate mode by either the LCD suspend switch or power-management timeout; the PC card and application program remain active.

3270 Emulation Credit Card Adapter
5250 Emulation Credit Card Adapter
Token-Ring 16/4 Credit Card Adapter
Credit Card Adapter for Ethernet
IBM Modem

In the following condition, the computer cannot enter the suspend mode.

While the communication link is running.
Active interrupts (CD-ROM activity, etc.)

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 setup program (if enabled).
If the battery condition is low the system enters the Safe Suspend mode and the configuration/setup information is saved. If the battery gets to critical the battery power indicator blinks (amber) and the system goes into the Hibernation mode.

Events that cause exiting or resuming of suspend mode:

(Resume) The LCD is opened.
(Resume) Real time clock alarm signaled.
(Resume) Ring indicator (RI) signaled by serial or PCMCIA device.
(Resume) Any keyboard key is pressed.
(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.

PCMCIA Data/FAX Modem
High Speed PCMCIA Data/FAX Modem
3270 Emulation Credit Card Adapter
5250 Emulation Credit Card Adapter
Token-Ring 16/4 Credit Card Adapter
Credit Card Adapter for Ethernet

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.
Critical low battery condition. The system first goes into safe suspend mode, then when the battery reaches critical the system goes into the hibernation mode.

Event that causes exiting of 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.

Doze Mode

In the Doze mode, the system slows down the central processing unit and the system uses less power. Enable the doze mode in the setup program. Exiting the doze mode is instantaneous by pressing any keyboard key.

Safe Suspend

Saves the computer state, then enters the suspend mode.

Back to

More INFORMATION / HELP is available at the IBM-HelpCenter

Please see the LEGAL - Trademark notice.
Feel free - send a for any BUG on this page found - Thank you.