Cropped Display

[dael at dael.de]

Hello

I want to install kubuntu on my media pc and tried the recent live cd.  
The Desktop started properly but the screen configuration seems to be  
wrong. Display is a TV with resolution 1360*768 60Hz via HDMI, kubuntu  
sets the right resolution the refresh rate is 59.8Hz, maybe this is  
also right?!

The problem is that the Desktop seems to be on the wrong position on  
the screen, the right quarter of the screen is black and on the left  
side the desktop is cropped.

Any Ideas? If possible I want to fix this with the live CD before  
installiung on hard disk.

Thanks
Daniel