IBM ThinkPad 340 Series Hardware Maintenance Manual page 224

In the following condition, the computer cannot enter the
suspend mode.
While the communication link is running.
When a serial mouse or other pointing device is
selected in the Config menu of Easy-Setup.
Events that cause entering of suspend mode:
Suspend mode is requested by the Fn key (Fn+F4).
The LCD is closed.
The keyboard is opened.
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).
The PS2 OFF command is set in the ThinkPad
Features program.
Events that cause exiting or resuming of suspend mode:
(Resume) The LCD is opened.
(Resume) The keyboard is closed.
(Resume) Real time clock alarm signaled.
(Resume) Ring indicator (RI) signaled by serial or
PCMCIA device.
(Resume) The Fn key is pressed.
(Exit) Timer conditions are satisfied to enter
hibernation mode.
Hibernation Mode:
following occurs:
The system status, RAM, VRAM, and setup data are
stored on the hard disk.
The system is powered-off.
The computer cannot enter hibernation mode when:
A serial mouse or other pointing device is selected in
the Config menu.
The computer is powered with ac power and one of
the following IBM PC cards is used.
– 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
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IBM Mobile Systems HMM
When in hibernation mode, the