Macbook pro to hdtv - Cant fit screen properly

Hello
i connected my macbook pro to my 42 panasonic plasma tv, and worked perfectly, even sound (using dvi to hdmi adapter), but im having this little issue, which is, the screen does not fit perfectly, im always missing the upper bar and ive read i could use the "underscan" option, but when its in mirror mode, its greyed out (means i cant play with it). Now, when i uncheck mirror mode (so both laptop and tv screen are active) then i am able to use underscan, but my idea is to use mirror mode only. Any idea how to solve this? Its not a problem on the tv's side, already played with all kind of configs without luck, so i just wonder why underscan is not enabled
any help will be appreciated

By design, most TV sets are designed to overscan -- that is they zoom the image slightly, so that you don't see artifacts that appear at the edges of the image. Most HDTV sets have a means to disable this feature. On Samsung sets, for example, it's called "Just Scan". This is probably what "Underscan" means for your Panasonic set.
If you are in mirrored mode and the resolution of the Mac isn't set to the same as the native resolution of the display (either 1920x1080 for a 1080p set, or 1280x720 for a 720p set), you can't disable the overscan. You need to set the Mac's resolution to that of the TV. The Mac display will be distorted as a result.

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Macbook pro to hdtv - Cant fit screen properly

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