This simple and brief tutorial is going to show you how to enable the hibernate feature in Ubuntu 14.04 Trusty Tahr.
Hibernate is disabled by default in Ubuntu, when the computer hibernates, all of your applications and documents are stored and the computer completely switches off so it does not use any power, but the applications and documents will still be open when you switch on the computer again.
Test if hibernate works in your case:
Before getting started, press Ctrl+ALt+T on your keyboard to open the terminal. When it opens, run:
After you computer turns off, switch it back on. Did your open applications re-open? If hibernate doesn’t work, check if your swap partition is at least as large as your available RAM.
Enable Hibernate in System Tray Menu:
The indicator-session was updated to use logind instead of upower. Hibernate is disabled by default in both upower and logind.
To re-enable hibernate, run the commands below one by one to edit the config file:
sudo -i cd /var/lib/polkit-1/localauthority/50-local.d/ gedit com.ubuntu.enable-hibernate.pkla
Tips: if the config file does not work for you, try another one by changing /var/lib to /etc in the code.
Copy and paste below lines into the file and save it.
[Re-enable hibernate by default in upower]
[Re-enable hibernate by default in logind]
Restart your computer and done.
Hibernate your laptop when lid is closed:
1.Edit “/etc/systemd/logind.conf” via command:
sudo gedit /etc/systemd/logind.conf
2. Change the line #HandleLidSwitch=suspend to HandleLidSwitch=hibernate and save the file.
3. Run command below or just restart your computer to apply changes:
sudo restart systemd-logind
That’s it. Enjoy!