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I have a shitty Sony Vaio that I would like to use as my HTPC.

- XBMC Live 9.11 repack
- VGA connection to TV

- dual screen (cloned)
- resolution is x768 full screen but there are huge black bars on the external monitor

How do I disable the laptop screen so I can set the TV's resolution correctly? I tried the FN+F key but it does not respond.
First open a terminal and type "xrandr" without quotes and enter. that is to fin out what the laptop display is. On mine it is LVDS1 so I will that as an example.

Try the command below:

xrandr --output LVDS1 --off

That will definitely kill the laptop screen... just remember to change "LVDS1" with whatever xrandr tells you what the screen is.

Do not know if it will fix your problem.. but it is worth a shot... BTW to get your laptop screen back just do a CTRL-ALT-BACKSPACE.