Hibernate option doesn't show in menu on Fedora 18

edit

I just installed Fedora 18 (Gnome) and now the option to hibernate the computer is not shown (only power off and suspend). This option was shown in my Fedora 17 and worked perfectly. Now I can hibernate the computer using the pm-hibernate command, but I wondered if this option can be showed again. I try also "Alternative status menu" extension for Gnome Shell, but the hibernate option is still missing. Thanks in advance.