Like with anything else these days in the world of computers and multimedia, there are 99 different ways to skin any particular cat, but here is a super-simple recipe for this situation. Because I like my "home office" to be in the living room, the main requirement is to be able to watch movies on the extended desktop - which is output to the new fangled flatscreen TV via a simple VGA cable (from a laptop) - while maintaining the ability to use the laptop without interrupting whatever's on TV!
So then, the all-Important and/or main H/W Ingredient is simply: a long VGA cable. LONG it should be all because you don't want to sit too close to the TV, as this can be bad for your eyes.
Instructions:
1 - Download and install (or use your synaptic package manager to install) the driver package for your ATI graphics card. This package should be called xorg-driver-fglrx.
2 - From a shell, as root, run the command 'aticonfig --initial --input=/etc/X11/xorg.conf'.
3 - Restart X with CTRL-ALT-BACKSPACE.
4 - Connect your laptop to the TV with the long VGA cable.
5 - From a shell, as root, run the command 'aticonfig --dtop=horizontal --overlay-on=1'.
6 - Restart X with CTRL-ALT-BACKSPACE.
7 - Your desktop should now be twice as wide, with the extended desktop to the right, visibile on TV and/or extra screen.
For more info, research aticonfig by running 'aticonfig --help'.
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