Fade to Black

Something weird is happening with laptop graphics cards. I've seen two cases so far in which a presenter was unable to project video from their laptop during a presentation. To be clear, what is displayed by the projector correctly matches all the windows, icons, etc. that are displayed on the laptop's LCD screen, but with one exception: The window in which video is displaying on the laptop's screen is black on the projected display--no video.

It turns out, based on some googling, that the problem is apparently related to the hardware video accelerator built into some cards. For some reason I don't understand, the video signal that the graphics card sends to the laptop's external video connector does not contain the output of the video accelerator subsystem. Why designer would think this is okay, given the vast number of presentations done with laptops, is beyond me.

I haven't confirmed it myself, but if you turn off the hardware acceleration either at the system level or in your video player software, then the video should be visible in the projected image.



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Josh Simons

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