Hello Herve, Bronxteck... thank you both for your time and replies
With Core i7-4710QM Intel integrated HD4600 I am unable to use ig-platform-id 0x0a260006. I tested 0x0a260006 with Fake ID 0x04168086 and FakePCIID + FakePCIID_Intel_HD_Graphics and my Thinkpad boots to a black screen.
I also tried different kext combinations, also injected EDID plus a custom EDID following excellent instructions here at OSXLatitude but laptop will still boot to a black screen.
Out of 16 Haswell ig-platfrom-id's my Thinkpad will only work with the following:
Desktop - 0x0d220003 --- > with Graphics Acceleration QE/CI but not perfect.
Mobile - 04160002 --> No Graphics Acceleration
Mobile - 0a260008 --> No Graphics Acceleration
The recommended mobile: 0x0a260006 with Fake ID 0x04128086 and RM's FakePCIID + FakePCIID_Intel_HD_Graphics seem not to work with i7-4710QM.
At the moment I have graphics acceleration QE/CI using the minimum configuration:
VID to IGPU with ACPI DSDT Patch
Fake ID with no ID set
IntelGraphicsFixup.kext ( with AppleBacklightInjector + IntelGraphicsDVMTFixup both removed )
If I remove IntelGraphicsFixup.kext from the minimum configuration above then the laptop will have no graphics acceleration.
I also tried smbios MacBookPro11,1 and had same problem.
Can you think of anything else that I could test, had a google around and there is loads of helpful Thinkpad T440 guides and no T540p's .
Please can you bear in mind, I'm not the most advanced hackintosher when it comes to DSDT / SSDT and patching.
I there anything that I could be missing that is preventing recommended ig-platform-id 0x0a260006 from working.