IntelAzulFB has no effect with GraphicsEnabler=No.
I see. So I've been doing it wrong all this while, even in Chimera. At any rate, I've exhausted all the combinations for both IntelAzulFB and IGPlatformID, which I suppose correspond to each other. According to Windows, and OS X when I can boot it in safe mode, my Intel HD 4600 GPU's device ID is 0416. But I've tried all the combinations, which includes that device ID (including 0x04160000, and 0x04160002). I get extremely inconsistent results. It works once, and doesn't the next. Odd thing is, even in safe mode, OS X dedicates 1536 MB VRAM to the iGPU.
Anyway, I'm going to try again, without GraphicsEnabler=No, and see if I can get consistent results (i.e. 5-7 consecutive boots with the same boot flags without a garbled screen or a hang at the IOBluetoothController line).
If I don't find a solution, do I have to resort to patching AppleIntelFrameBufferAzul, the EDID, or a DSDT? I'm still booting off my installer USB, and I want to see it fixed on that before I can be sure it will work when I install Chameleon/Chimera on my OS drive.