Hey there toleda, I am getting close, and by luck, but regardless here is where I am at:
Fresh installed a few times, and one of the times the audio just worked, when I say it worked, I dont have any sound, but I do hear the sound of the hardware initializing like I used to with mavericks right before I see the login screen. Here is the rundown.
1- All devices show, but no sound. I hear the initialization of the audio right before login screen.
2- Yosemite, Gigabyte z78 UH5Dm, not sure on the bios version (if it's a dealbreaker I'll get it), i7, GeForce 550
3- Standard install guide
4- Attached
5- Attached
6- N/A
7- Not really sure how to pull this, pardon my ignorance here. I dont see any way to filter this console output by sound assertions.
8- Attached
9- Attached
Let me know if there is anything else you need. Im not touching nothing this time until you've had a look!
Thanks for the help.