Am using Ubuntu Lucid + kubuntu-desktop. NVidia works fine. Screensavers set to autostart & worked fine after initial install. Now screensaver attempted to start (brief flash of black only) but since quit doing that.. All screensavers work fine in Test mode. Is there a file entry that controls this?. kde/autostart is empty - should there be an entry here? Would the log files show up any relative errors? I am a newbie & the log info is way out of my league! Have not found any relative posts here or other forums. I would appreciate suggestions.
Make sure kscreensaver is disabled: System Settings -> Display and Monitor -> Screen Saver -> Make sure that Start automatically after: is unchecked.
Make sure xscreensaver is installed. You should have a Screensaver option in settings menu. Activate the xscreensaver you want to use.
In your user directory ~/.kde/Autostart/ create the file named: xscreensaver.desktop containing the following lines:
Log out and log in again. xscreensaver should work fine.