Remember this error:
“iTunes/Apple Store Content Access Problem. Content playback may be disabled on this computer. You can continue to use the machine, but you should contact an Apple support representative. ErrorCode: 8877652”
Well. That appears to be found in Skylake based hardware, but I have good news for you. You can solve this by renaming Device (HECI) to Device (IMEI) in your DSDT/SSDT and then this error:
kernel[0]: IG: ME PCI ACPI device not found – PAVP services will be disabled – add IMEI to EFI / ACPI device list
In /var/log/system.log will also be gone. By the way. PAVP is short of Protected Audio Visual Path
Note: You may not see the above error without the ioppf=0xfff boot flag!
Update: I should have made it clear that the AppleIntelSKLGraphicsFramebuffer.kext checks for “IMEI” so this is meant for people with Skylake based hardware!
Pike's Universum 
Sweet! Thanks for the work!
Must be based on system def. macpro6,1 had HECI and not IMEI.
AppleIntelSKLGraphicsFramebuffer.kext checks for “IMEI” and Apple can change the name with a firmware (EFI) update, for Skylake based hardware. One that accompanies the installer for example.
p.s. You can of course also use a search and replace algorithm to change the string in the kext 😉
Well Clover Fix DSDT got survived. How do you do sir?
Cool. Thank you for reporting that here. And I am fine. Thanks!
I´m very happy to see that you are feeling fine, and you are one of the very best developers ever .
Thank you for all your hard and well done work.
Regards,
Javier BV.
I wonder why Apple’s developers prefer to make their drivers refer to ACPI devices by label instead of _ADR and _HID. 😦