I think some projectors will not display anything if resolution is not correct, and otherwise there will be some downsample from high resolution to low resolution.. so it's best to just pick the right resolution, I suggest to experiment with this.
for example, my old broken laptop compaq M700 loses color red in 1024x768 to the video output, and my projector will sync in that, but there is no color red, so i choose to reduce to 800x600 and then i get a sharp enough image with color red.
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