There is no such thing as XUbuntu 10 - do you mean XUbuntu 10.04 or XUbuntu 9.10?
The issue is unclear from your description - do you mean that the whole xubuntu desktop appears on the TV, but only occupying part of the TV screen, or do you mean that only part of the desktop is displayed, filling the entire TV screen? Or some mixture of these two situations?
What is your video card? (lspci)
What is the max resolution supported by your TV?
How are you using the output - as a second monitor or as the only monitor?
If you use two monitors, like with a laptop, the default is often to use the higher resolution of the two monitors on both - which may result in the lower resolution screen not displaying the whole desktop. The quickie solution is to reduce the resolution.
For fancy stuff you want to configure dual head for your video card.
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