Fill the cup to inhibit auto suspend and screensaver!
This extension supports gnome-shell 3.4, 3.6, 3.8, and 3.10.
https://extensions.gnome.org/extension/517/caffeine/
git clone git://github.com/eonpatapon/gnome-shell-extension-caffeine.git
cd gnome-shell-extension-caffeine
cp -r [email protected] ~/.local/share/gnome-shell/extensions
Restart the shell and then enable the extension.