Thanks for the info. I took it and tried somethings. I'm at the point now that if I disable optimus then I can use the dvi. If I enable optimus I cannot.
With optimus enabled, my about this mac shows the intel hd 4000 and seems to overall work better. In this state I have to fn - f8 to push the video to the external monitor using VGA but then no matter what monitor I use, the ioreg as well and SwitchResX always displays the same EDID info.
If I boot the with the lid closed, all I get is the clover screen on the external VGA display. The drive runs a lot and the laptop display is blank. To recover I have to power off.
Do I have to modify the dsdt ? I attached it because the PEG part looks different then the dsdt I used with mountain lion.
Thanks!
/Paul
DSDT.aml.zip