Ever get anywhere with this? The latest driver on 10.10.1 gave me the same trouble with my 660Ti an Seiki 4k tv.
Figure I'll have to stick with 10.10.1 as well.
Same issue here. I've tried the multibeast patch which didn't appear to actually do anything. I tried the linked perl patch and verified it was patched via hash. I just tried the linked 10.7.4 kext. Nothing has worked so far.
Re: 10.7.2 Cannot get ATI HD 4890 to work 1920x1200
I setup 10.7.2 on my machine for a few days recently using a 4890.
IIRC I used GraphicsEnabler=YES and installed only the 4890 QE/CI patch for 10.7.2 after installing the 10.7.2 combo update.
There used to be some requirements to put the 4890...
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