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Power management may be incomplete or unsupported

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Hi everyone, finally I managed to have a successful installation of Niresh's Yosemite Zone 10.10.1 on my AMD configuration with this specs :

Mobo: Asus M5A97 EVO r2.0


GPU: Sapphire Radeon r9 270x vapor x

HDD: Western Digital Caviar Blue 1tb

Ram: 8gb 1600mhz corsair vengeance

I boot with /amd npci=0x2000 -v and the installation has completed successfully but when the PC restarts and when I boot with npci=0x3000, computer shows me a grey screen with an infinite spinning beachball cursor. I can only enter Yosemite in safe mode whit boot flag "-x". I tried lots of boot flags include "GraphicsEnabler=No" and the result is always the same grey screen. I've set the uefi bios disabling Vtd, turning on AHCI and so on without result. When I boot in Verbose mode with bootflag "-v" the black screen with white signs shows me after PCI configuration :

"Warning: IOPlatformPluginUntil : GetCPUIDInfo: this is an unknown CPU model 0x3a
--Power management may be incomplete or unsupported"

Please help me




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You've got an AMD CPU, that's not used by Apple nor natively supported by OS X, hence no CPU power management. That's perfectly normal. Only Intel CPU can enjoy proper native CPU power management. This being said, your issue has nothing to do with CPU power management.


If you booted your installer successfully with option npci=0x2000, I'm failing to understand why you switched to npci=0x3000 afterwards. Just make sure you've installed a FakeSMC kext to your installation, that's absolutely mandatory.




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About the rules, we do not support any commercial project or distro, but Niresh is not commercial and it can discussed freely on IM.

Of course, we strongly suggest using official installers to be aware on what are we running and installing



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As Herve mentioned it's normal on AMD systems. You can use VoodooPState to get better power management. Install the kext to either Extra/Extensions or System/Library/Extensions and the app to the Applications folder and set the app to run on startup.


Attached File  PState.zip   499.37KB   19 downloads


If npci=0x2000 worked then use that but I also recomend you update the kernel as the one bundled is not up to date. Use this kernel instead, http://nova-x.co.uk/...10.10.5_rc1.zip


Place it in the root of your HDD and instead of /amd use /kernel

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