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R9 280X Yosemite

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I have Yosemite installed on my PC using Ozmosis with FakeSMC baked into my UEFI firmware rather than using a bootloader.

My 280X is supported without any drivers but I can't seem to get dual screen working.

My main screen is connected via DVI and second screen via HDMI.

Do I need a driver or is there something I can change?

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