I am having some trouble to patch my own Vanilla DSDT to get a working audio device. I downloaded a DSDT for a Lenovo T420 provided by manwe150 witch works fine for audio with patched applehda.kext.
Now when I try to add the Methods from manwe150's DSDT into my own, the audio device won't show up in device manager no more.
Since I don't have any experience with patching DSDT I don't now where to start looking. I am using DSDTSE right now to compile my DSDT.aml,
Please find attached 2 DSDT files one with working audio, one without.