Toleda, thanks for the reference. Everything I have checks out with this guide, with the exception of the following
For HD3000, the guide recommends in the DSDT:
HD3000: as above for AAPL,ig-platform-id
edit AAPL,ig-platform-id to AAPL,snb-platform-id
edit 0x07, 0x00, 0x62, 0x01 to 0x01...