March 10th, 2014 11:12 PM
Bad news. This not correct, not close.
No UEFI, 5series AMI; dsdt edits may not work.
Google search for IDT AppleHDA.kext solution.
No idea if GT 230M HDMI audio is supported.
IOReg/GT 230M: P0P2@3
Try the edits, reply with edited dsdt.
Patch edit file
Find (2nd instance)