Here is another quick update:
I updated the source code of AppleIntelInfo.kext to version 1.2 and one of the improvements is that it no longer uses /var/log/system.log but /tmp/AppleIntelInfo.dat (see README.md
I know. This has been on my TODO list for ages, but here it is. Have fun now!
Pike's Universum 
Hi Piker, I have one quick question for you if I may. I have a Gigabyte H87-HD3 Motherboard and I’m using Clover with SSDT generated by your tool. No P/C states and Cpu0Ist and CpuPm dropped tables. PM seems to be working correctly (Intel Power Gadget shows a nice graph). However, AppleIntelInfo shows a decent amount of pstates after a couple of minutes, but only (8) or (34) or (39) are ever in parenthesis (which I guess means “current state”). The same shows if I actually log Intel Power Gadget… the graph is OK but the log says 800, 3400 or 3900.
XCPM is enabled and I don’t get warnings or errors on boot. Everything seems OK. Is there something wrong? Should I care? Is it XCPM who makes difficult for tools to read current pstates correctly?
Sorry, I forgot to mention I’m using an i7 4770 (non K)!
Nope. Only 8, 34 and 39 are triggered by software. The rest is triggered by Intel firmware.
Great, I’m glad to hear everything is alright. This was the only thing that was puzzling in an otherwise perfect Yosemite install! Thanks!