The default screensaver preferences are stored in the /usr/share/X11/app-defaults/XScreenSaver file. To start the Screensaver preference tool, run the xscreensaver-demo command from the /usr/bin/ directory. To start the Screensaver preference tool from System menu, choose System → Preferences → Screensaver.
To set default screensaver preferences for all users, modify the XScreenSaver file. Or, you can use the XScreenSaver dialog to create a $HOME/.xscreensaver file, then copy the file to the location of the XScreenSaver file.
To restore the default settings for a user, delete the $HOME/.xscreensaver file from the user's home directory. If no $HOME/.xscreensaver file is present, the system uses the default preferences in the XScreenSaver file.
To activate changes to the screensaver preferences, use the following command to reload the screensaver preferences:
# xscreensaver-command -restart
To modify screensaver application preferences, you can use the Screensaver preference tool. When you modify the screensaver preferences, the preferences are stored in the user's home directory, in the $HOME/.xscreensaver file.