Hello,

I remember distinctly that, when I had my fglrx drivers installed, KDE had an option on the menu to 'switch users' (i.e. start a new X server). Back then I didn't dare try it because ATi's drivers can't handle that. However, I have recently installed the nVidia drivers (and bought a card), which allows for multiple simultaneous X servers, but the menu option on KDE has mysteriously disappeared. I have checked my Xservers file, but all the lines are uncommented. Does anyone have any idea how I could re-enable this?

Thanks in advance!

I think you need to be running KDM toget that option. Are you using KDM as your display manager?

Yeah, it's the standard KDE login screen so it should be KDM.

Take a look at this thread. I am not sure whether it will help you, but its worth taking a look at.