I have a high-def monitor plugged into a laptop that I use to do everything: problem is, my laptop screen won't go over 1024x768 so it always mirrors just the top left portion of the display. This is obviously a pain when it comes to video playback as its rendering it twice, but other than that, its just irritatingly distracting!

As I use TWM, there's no easy way to switch the laptop screen off so I wanted to know if it can be done via Bash? I've googled around but I couldn't find anything...best I could find was xset which switches everything off...

Oh, and I don't like GNOME or KDE, which is why I use TWM. I quite like its simplicity as well; a happy medium between command line and GUI without the mess...

Any ideas? All appreciated (as long as solutions come with the way to turn it back on should something go catastrophically wrong)

Ta!!