Toshiba Satellite U840W - Manual (Page 87)

Sleep Mode: Data will be maintained in the computer's memory.
Please refer to the sections Turning on the power and Turning off the
power in Chapter 1, Getting Started for further information.
Windows utilities
You can configure various settings associated with both Sleep Mode and
Hibernation Mode within the Power Options (to access it, Start -> Control
Panel -> System and Security -> Power Options).
Panel power on/off
You can set up your computer so that power is turned off automatically
when you close the display panel, and turned on again when you open it.
Please note that this function is only available for Sleep Mode or
Hibernation Mode, not for Shut Down Mode.
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
Special
features , in Chapter 4 for an explanation of how to set the duration.
User's Manual 5-7