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Moderator

RE: Dell U2417H displayport daisy chain mirrors, but does not extend.

I do not think that  the monitors are at fault here. Then the only other option is to test them on another computer. Preferably a computer with an added video card that has DP out or mDP out. Also contact HP support and ask if they successfully tested that system in a two monitor DP 1.2 daisychain.

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