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1It's not working more than likely due to the fact it's disabled due to the dGPU you have installed.– RamhoundCommented Mar 2, 2021 at 19:14
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Check to make sure it's not the monitors themselves. I had an issue like this and it turned out to be that particular monitor brand's DP ports just die unexpectedly.– CaseyCommented Mar 2, 2021 at 19:31
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Are these 3 ports in 2 different physical locations, or do they all come from one single 'backplate'. My 3-port GPUs have an either/or structure so any two will work, but not a third.– TetsujinCommented Mar 2, 2021 at 20:47
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@Ramhound I forgot the term for this technology, but my laptop supports both active graphics card at the same time.– user1224499Commented Mar 3, 2021 at 4:57
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@Casey I have tried 2 monitors. Same issue in both brands– user1224499Commented Mar 3, 2021 at 6:51
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