System Automatic Sleep/Hibernation - Toshiba Libretto W100 User Manual

If the panel power off function is enabled, and you manually shut down
Windows, do not close the display panel until the shut down process has
been completed.

System automatic Sleep/Hibernation

This feature automatically turns off the system in Sleep or Hibernation
Mode if the computer is not used for a set duration. Refer to
features, in Chapter 3 for an explanation of how to set the duration.
User's Manual
Power and Power-Up Modes
Special
5-10