problem with gpu scaling on kubuntu

Mon Nov 15 21:15:47 UTC 2010

I have an ati hd5770 and kubuntu. I have my lcd monitor connected to my tv
in clone mode.
In windows
I can change the slider of scaling options to can scale the image near of
option overscan so I can see all the display on my tv with the pc
resolution.

In linux the option of scaling options is disabled and I cant move the
slider to move near of the overscan option to do the same as Windows.

Could you help me please?
Many thanks and sorry for my english!
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