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I tried AMD6000Controller.kext and AMDFramebuffer.kext from yosemite but not worked.

Thanks for good information. i'm using 6870 and i followed this solution but not worked. I want to see your config.plist. Could you upload this? And are you using own dsdt? These information will help who has this problem. Thank you.

I'm using Radeon hd 6870 and have a same problem. Maybe all radeon graphics are have this issue. i found this log when i wake up my device. 10/2/15 6:26:05.000 AM kernel[0]: ATIFramebufferNI::setPowerState(0x565992bd9f2abb73, 0 -> 1) timed out after 45845 ms Looks like...