A strange issue started occurring with my hack shortly after the 10.9.2 update.
Currently, I'm using a patched DSDT and AppleHDA (thanks to toleda's guides) to enable onboard and HDMI audio with my GA-x79-UP4 system. And they work just fine. I don't believe there's any problem there.
However, shortly after resume from sleep, audio is lost across the entire system about 2 out of every 3 times. Onboard, HDMI and USB are all gone. Using the terminal to kextunload and then kextload AppleHDA restores audio... but that's going to get old pretty fast.
I think I'm experiencing the same issue that's been affecting some real macs with mavericks. The symptoms, cause and 'cure' are the same by the sounds of it.
Rolling back to earlier versions of AppleHDA don't seem to do the trick, nor does using other ways to enable HDA i.e. kext instead of DSDT. So I'm almost certain the problem isn't related to anything hackintosh.
So what I'm trying to work out is: what about the 10.9.2 update triggered the bug? It was fine on 10.9.1.
Anyone else out there experiencing this or have any input?