I just did this install a couple days ago and now I have the problem where when trying to boot I get the P-State Stepper Error 18 followed by a kernel panic, and it happens quite frequently, the worst was one time it took five or six retries before I finally got it to boot. It seems random, sometimes it will boot without issue but other times this annoying problem persists. I read in another thread that one possible solution is to install the NullCPUPowerManagement.kext shown above. I'm a little confused, though - utsi says it goes in /EFI/CLOVER/kexts/10.11/NullCPUPowerManagement.kext but I don't see an EFI directory off the root directory, just one called EFI-Backups. So do you install it by directly copying it somewhere, or do you use a program like KextBeast or what? If I am supposed to use KextBeast then do I need to tell it to put it in a particular directory (/Library/Extensions or
/System/Library/Extensions)? I only ask because in the other post it said that NullCPUPowerManagement.kext should be installed to to /Library/Extensions, which is not the location utsi suggests.
Also, what impact does using NullCPUPowerManagement.kext have on the system - is this okay as a long term fix or does it take away from the system performance in any way? I want to make sure that there's no way that installing it could make my system totally unbootable, or reduce the CPU performance or anything. I really don't know how that kext operates so that's why I'm asking. Also, how difficult is it to uninstall a .kext if it does cause a problem?