The tricky part is that when you disconnect the main VGA monitor the whole desktop is set to the HDMI and whole secondary monitor trick just f***s up, so i made a quick search on the internet and found way to trick GPU to think that it is actual monitor connected as VGA and set that to default desktop and do not transfer desktop to the HDMI. i have school TV setup that needed an external HDMI audio/video output as secondary monitor on windows xp system.
I found cheapest way to trick pc by physicaly making an dummy VGA (XGA,RGB) analog connector by simply putting three resistors from 50 up to 150 ohms on some connections.
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