Dell laptop: HDMI output has black border

When I upgraded to WIndows 7, my Dell Studio 17 suddenly lost the ability to display 1920x1200 (1080p) in full screen mode, either on the laptop display or my Philips 24 inch monitor.

I couldn't find any answer to it within the Windows display settings or control panel, and after a long time rooting around on Google and trying various things, I discovered I needed to:

a) Download the latest Catalyst drivers and control suite.
b) Once installed, use the 'scaling options' to adjust the size of the output display to 'match my flat panel'.

Finally! Back to a usable full screen without having to compromise on resolution.