screensavers are controled where?

On my 8.1 SuSeE I run KDE. In the desktop menu I have excluded the running of the socalled screensavers. Don't know how and why but after working a little on some programs and trying to fine install things, I have now screensavers popping up after five minutes of inactivity. They consist of nice mathematical figures. Where do they come from and how can I stop them? They are not from the KDE menu because that still says that screensavers are not activated.