I installed ubuntu 12.04 on my old laptop with SiS671 video card and its working fine with 1280x800 screen resolution. I also connected my external monitor and its working too but I want to turn off laptop's monitor and I can't find any references to external monitor.
When I try to access System Config > Monitors it only shows "laptop" monitor.
typing Xrandr on terminal results:
xrandr: Failed to get size of gamma for output default Screen 0: minimum 640 x 480, current 1280 x 800, maximum 1280 x 800 default connected 1280x800+0+0 0mm x 0mm 1280x800 60.0* 1024x768 75.0 70.0 60.0 800x600 75.0 72.0 60.0 56.0 640x480 75.0 73.0 60.0
How can I turn my laptop monitor OFF and use ONLY the external monitor? thanks...