Lenovo notebooks can use the PowerCfg command line tool to enable the hibernation function. To do this, you can follow these steps:
1. Click "Start" and find "Command Prompt" in "Accessories" , right-click Command Prompt, and then click Run as administrator. (If prompted for an administrator password or confirmation, type the password or click Continue.)
2. At the command prompt, type powercfg /hibernate on. You can now re-enable hibernation.