If you use frequently a mobile internet connection with a monthly traffic limit, like me, you probably want control over automatic updates to avoid wasting traffic data.
GNOME 3.14 has a feature to automatically check for new updates using its gSoftware application. This feature can be disabled using the gsettings command line tool:
$ gsettings set org.gnome.software download-updates false
If you are not familiar with the terminal, also the graphical dconf-editor can be used.
First you need to install it:
$ sudo yum install dconf-editor
then, as normal user run it:
now navigate to org.gnome.settings-daemon.software schema and un-tick the download-updates flag:
If you are using an older version of GNOME the schema is slight different. For Fedora 20/GNOME 3.10 you can take a look at this post http://worldofgnome.org/fedora-20-gnome-software-tips-and-tricks/.