Did a fresh High sierra install and was able to get to the desktop, which is extremely choppy and garbled as you can see on the attached picture.
I tried countless ig-platforms-ids for my HD400 and the one which came by default on RehabMans config.plist was the one which actually "worked", choppy af but I got an image at least, all others would just either reboot or give me insane graphics. id being: 04006601
* Also disabled my dGPU by following this
guide. (havent checked if it worked though, how can I check that?).
* The config.plist provided by RehabMan wasnt bootable at all, I had to untick inject Nvidia and slide=0 (maybe this last one doesnt matter, but inject nvidia had to be unticked afaik).
Upon googling, RM suggested this could be fixed by enabling/disabling CSM in BIOS, sadly my BIOS has no toggle related to CSM whatsoever.
Ill attach a pic of the garbling as well as my efi folder.
Target machine: Samsung NP550P5C-T01AR - i7 3610QM & Nvidia GT-630M with optimus.
Thanks!