Help fixing audio on Dell Latitude E6400

Hi, I have recently installed Mac OS X Yosemite on my Dell Latitude E6400. Everything works except audio.
I do know the audio codec, It's the: IDT 92HD71B7
I have tried to edit the layout-id in the DSDT, but I don't know if I did it right

I have also tried the VoodooHDA kext, it does work but, the audio barley works, and changing volume doesn't do anything.