Tip – Enable Hibernation in Ubuntu 12.04

If you’ve installed your operation systems correctly, then both Windows and Ubuntu will support the stand-by and hibernation functions.

In the latest Ubuntu (12.04, Precise Pangolin) you have to enable hibernation manually.

  • To test whether hibernation is working, open a Terminal and run the following command:

    sudo pm-hibernate

  • If Ubuntu powered down and on restart resumed the previous state correctly, then hibernation works. When Ubuntu prepares hibernation it may display error massages (like bluetooth, rt2800pci – wifi) for a short time,  but it’s all good as long as it restarts properly.
  • Open a Terminal and execute the following command:

    sudo gedit /etc/polkit-1/localauthority/50-local.d/com.ubuntu.enable-hibernate.pkla

  • Paste this text into the file:

    [Re-enable hibernate by default]

  • Save the file and close gedit.
  • After reboot, you’ll be able to use the hibernate option from the system menu.

Source: Ubuntu-Help

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