System Automatic Sleep/Hibernation - Toshiba L40 Series User Manual

If the panel power off function is enabled and you use Shut down
Windows, do not close the display until the shut down function is
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
explanation of how to set the duration.
User's Manual
Special features, in Chapter 1,
Power and Power-Up Modes
L40 Series Features for an
6-11