I want to say thanks too... IT WORKED! .. my card did not have a black screen it looked more like 4 bit graphics. i was having to do the sleep trick via ssh (sudo pmset sleepnow) or hot keys alt,cmd,f12 to get it working... so glad a plist edit fixed it :)
I also linked this thread to the...
I updated via app store from 10.10.2 and the only 2 thing i needed to fix was reload RTC kext (for cmos clearing) no idea why the chameleon flag for it stopped working and my HD 7770 was borked i had to ssh to do the sleep trick (sudo pmset sleepnow).
but alas there is a real fix found in this...
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