Toshiba F15 - Manual (Page 286)

286 Hot Keys
Hibernation mode
5.375 x 8.375 ver 2.3
Hibernation mode
Fn + This hot key places the computer into Hibernation
mode.
If Hibernation mode is enabled (the default), a message
box is displayed by default to confirm the computer is
going into Hibernation mode. The message box can be
set so it does not display.
Sample Hibernation confirmation box
If Hibernation mode is disabled, this hot key will not
respond.