In Linux Mint 13, when you click on the shutdown button in the menu ( in both MATE and Cinnamon), you will see options for suspend, restart and shutdown respectively on the log out window but there is none for hibernation.
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To manually hibernate your computer, you can open the terminal and run the following command:
sudo pm-hibernate
The more convenient way is to get the hibernation option on the log out menu. To do so, you just need to create the file /etc/polkit-1/localauthority/50-local.d/com.ubuntu.enable-hibernate.pkla. For example, in MATE, you can run the following command to create this file (replace pluma with gedit if you are using the Cinnamon edition):
sudo pluma /etc/polkit-1/localauthority/50-local.d/com.ubuntu.enable-hibernate.pkla
After the file was created, copy paste the following lines into it:
[Re-enable hibernate by default]
Identity=unix-user:*
Action=org.freedesktop.upower.hibernate
ResultActive=yes
Save the file and reboot your computer. From now, there will be a "hibernate" button on the logout window and you can click on that button to put your computer into hibernation:
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