gnome-shell-extension-caffeine

Fill the cup to inhibit auto suspend and screensaver!

This extension supports gnome-shell 3.4, 3.6, and 3.8.

Installation from e.g.o

https://extensions.gnome.org/extension/517/caffeine/

Installation from git

git clone git://github.com/eonpatapon/gnome-shell-extension-caffeine.git
cd gnome-shell-extension-caffeine
cp -r caffeine@patapon.info ~/.local/share/gnome-shell/extensions

Restart the shell and then enable the extension.