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I can confirm that HDMIAudio 1.1 is working perfectly for AMD HD 7770 under 10.10.3 . Thanks so much for this !

The solution is posted here : http://www.tonymacx86.com/yosemite-desktop-support/161361-10-10-3-update-black-screen-cursor-2.html#post1018020 . To make things easy, someone posted an already modified AMDRadeonX4000.kext . I have attached it to the post. Just install using Kext Utility. Had...

I'm in the same boat as you , same videocard. Will try to roll back to 10.10.2 video kexts to see if it helps. Works fine in safe-mode.

Hello vrondena, I have attempted to use your method to activate the 520M card on my Acer 5750G without any success. I have also attempted using a pre-patched dsdt or applying a 520m patch to my dsdt with the same results. Would it be possible to make a detailed step by step procedure for this...

Article: OS X 10.8.3 Update Yeah, but can it run crysis ?