I have been using ig-platformid= 0x0a260006 on a GA-Z97M for a while still have QE/CI on 10.10.1. (Proc. i4790k).
Hi mate, many thanks for your input. Unfortunately, on my GA-Z87N-WIFI with Core i7-4790K, your injected value of 0x0a260006 does not work for me.
On my new Mavericks 10.9.5 install, the monitor would constantly go to sleep and wake up, and seems can't even enter Desktop via Remote Connection! Something never completed loading...
On Yosemite 10.10.1, I do get into the Desktop, but the artifacts and issues faced are extremely bad. Anti-aliasing is bad, artifacts and the rest!
After trial-and-error I managed to get it working and stable, with value 0x0c260000 amazingly enough. No other patches or DSDT fixes, just this injection in Clover.
I must note that I am using the second port on my monitor which is HDMI as the DVI is taken already. What port were you using? Perhaps DVI doesn't have such issues on your value? I have no idea...
Can anyone shed some more light on these different values, please? Why would one work on Z97 board and not on a Z87 for example, with same CPU model?