Sony VAIO VGN-FW User Manual page 126

Troubleshooting >
Battery
Can my computer enter Hibernate mode while running on battery power?
Your computer can enter Hibernate mode while running on battery power, but some software programs and peripheral
devices prevent the system from entering Hibernate mode. If you are using a program that prevents the system from entering
Hibernate mode, save your data frequently to avoid losing data. See Using Hibernate Mode
how you can manually activate Hibernate mode.
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