[kde] How to setup dual monitor in kde?

Hello,

I would like to extend my desktop to my second monitor. KDE defaults
to clone the image of the main monitor on the secondary monitor.
I can setup the desktop the way I want, with the secondary monitor
above the primary one, using KDE System Settings. However, this setup
does not survive a reboot and every time I turn on the computer, I
have to setup the desktop again.
Is there a way to make the dual monitors configuration to stick using
KDE's GUI tools or do I need to create a xorg.conf file and edit it
manually?
I'm running Kubuntu 12.04 (Precise Pangolin).

Thanks,

Marcelo
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