Hey, RehabMan,
Sorry to trouble you again.
After several unsuccessful attempts for driving my graphic card (HD5600) by injecting the appropriate ig-platform-id, I decided to switch to patch dsdt for the same purpose, but when I put my modified dsdt in the patched file of clover and tried to boot, there is a prohibition sign when booting.
Detailed pictures and EFI without themes were shown as below. (OS X10.11.3)
In addition, I would like to explain some settings:
1, AHCI mode is enable.
2, I also set HFS partition ID=48465300-0000-11AA-AA11-00306543ECAC.
3, Clover files was put in my EFI partition of HDD (not in USB disk).
4, The attempts of removing all kexts in Clover except FakeSMC.kext were invalid ,and totallyFixStillWaiting.kext was also of no effect.
5, Delete /System/Library/CoreServices/PlatformSupport.plist was also noneffective.
It would be very kind of you for solving this problem, I'm always learning and accumulate so much expericence of hackintosh from you.
Really gratefull for your helpful assistance.