Sony PCG-GRX580P - Manual (Page 45)

Hibernate mode
In the Hibernate mode, the state of the system is saved on the hard disk drive and power is turned off. The power indicator
is off in this mode.
To activate Hibernate mode
1. Press the key combination Fn + F12, or press the power button and release it immediately. The "Save to Disk
Manager" window appears and the notebook enters Hibernate mode.
Note:
Do not move the notebook until its power indicator turns off.
Pressing the power button and releasing it immediately caused prior notebook systems to enter Standby mode.
2. Press the power button to return to normal mode.
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