Here are the report files.
Exactly. I have removed the AppleIntelBDWGraphics.kext in order to boot with a correct ig-platform-id with brightness control and HDMI out. If I keep that kext installed, It won't boot.
Of course I don't expect it to work this way. I just can't understand why it won't boot and hangs once graphics injection is done if the kext is installed.
See the screenshot of the verbose boot screen on post #43. It says that acceleration is running but it just freezes there. No HDD activity etc. That's the only "problem reporting" data I can provide since it won't boot.
Here they are.