I solve it use follow these steps:
- Click Start, and then type cmd in the Start Search box.
- In the search results list, right-click Command Prompt, and then click Run as Administrator.
- When you are prompted by User Account Control, click Continue.
- At the command prompt, type powercfg.exe -h off, and then press Enter.
- Type exit, and then press Enter to close the Command Prompt window.
restart the pc an do this again and now "on":
To make hibernation available, follow these steps:
- Click Start, and then type cmd in the Start Search box.
- In the search results list, right-click Command Prompt, and then click Run as Administrator.
- When you are prompted by User Account Control, click Continue.
- At the command prompt, type powercfg.exe -h on, and then press Enter.
- Type exit, and then press Enter to close the Command Prompt window.
These step work ok for my Lenovo T520 notebook with Win7 OS.
good luck Jorge