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Seems like faulty cable/DP-HDMI adapter

If your DP monitors support it, you can use DP-daisychaining. I've tested it on 10.12.6 with radeon 7950 and with rx480, no issues. Been able to connect two 2560x1440 monitors (separate desktop each, no mirroring) to one DP port, I assume the other DP port could drive easily another two (I only...

I decided to give daisy chaining a go, and so far, the results are positive. OSX 10.12.6, Radeon 7950 with 2 DP outputs, I have 3x Dell U21715H connected to it. Up to now I used two DP outputs + 1 HDMI to drive the third monitor, but today I tried connecting it through the DP output of one of...

I think historically the newly released models had some customised versions of OSX installed on them to support the new features, and then those features landed into the main codebase later on. So the new iMacs/MacBooks might come with customised 10.12.5, and then the new features (updated...

Thanks for the info, one more reason to upgrade graphics and switch to nVidia team. I really hoped the Radeon support in Hacks will improve, but I just lost hope when nVidia finally released the Pascal drivers.

I also experience the very same issue on my Radeon 7950, but didn't find any solution so far...