Depending on your model, you have to manually change the xorg.conf or XF86config. GUI programs will not work.
nVidia graphics cards are preferred because their ease of setup. Computers with ATI and Intel graphics may have to use framebuffer. Unfortunately, LCD monitors do not work well with framebuffer modes.
You are saying where it shows the TV material. It is black on the TV or projector. That is how ATI cards work. They use a framebuffer for the acceleration to overlay the video on the window. You can use mplayer and use x11 as its video output device although it is a software scaler that is slow. The ATI acceleration should not be used when you use x11 as the video output device. If it still shows the black window with x11 as being the video output, use a VGA to TV converter (actually a rescanner) to output to the projector. You may have to turn off the LCD in the settings to make either VGA or S-Video to correctly display the TV material. I think the gatos project may have fix this problem by turning off some encyrption.
In the future, I recommend buying a notebook computer with nVidia graphics chips instead of ATI.
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