Thanks for the great work, guys! This works very well with my Realtek ALC892 on the GA-P55-USB3 build below.
I do have to unplug the rear panel green line out on the rear panel in order to use the front panel green line out headphone jack, so I am hoping some solution can be found to avoid this inconvenience. This is something I did not have to do with the old (2out, 1in) ALC892 solution.
Presently I have the rear green line out connected to my Samsung T260HD monitor TV audio input, and use the headphone jack on the monitor, so it is not much of a problem.
Thanks again! Followed the installation instructions exactly with the new DSDT.aml for my MOBO on the desktop, checked User DSDT, ALC8xxHDA + AppleHDA Rollback + System Utilities in MultiBeast 3.0.3, and the reboot went smoothly!