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Disable SpeedStep on a Late 2011 MBP with Yosemite

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Hello friends! Today I need your help again, my battery died, so I removed it, but now my computer is running very slow, the fans wont turn up, and the performance in general is very poor! I read that this is a common problem on the Mac when you remove the battery, and has something to do with the power management. I found some proposed solutions too, but none specific for OSX Yosemite. I thought of installing NullCPUPowerManagement kext, but didn't tried it yet.


Thank you in advance for any help, link or advice!

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Interesting see if the above link makes sense as they refer to your earlier post on the power management.  Keep us posted if it works.


Lou Cioccio


I tried it... Crashed with kernel panic at boot... I will try again and see if I can get yosemite to boot... I've read that Yosemite kernel brought the power management to inside the kernel, if thats true, I guess I will have to wait to buy a new battery and stay with windows...

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  • 1 month later...

So, after researching more and trying other methods, what can I say:

  • This question and it's answer pointing here will help you with problems where processes take a lot of percentage from the processing time. Doing the trick will turn your macbook useable, but the Ghz will stay at minimum.
  • The new kernel power management works only from Ivy Bridge forward, so Macs equiped with Sandy Bridge or older processors still using the old power management and therefore the kernel patch won't work.
  • Removing AppleIntelPowerManagement kexts won't help, and NullCPUPowerManagement won't help too... I Still get the same 0.8Ghz.
  • Using apps like SMCFanControl will help with controlling the fans, so any reply that helps getting the original clock are welcome and the chance of burning the processor due to heat are diminished.

If someone can help me getting the extra Ghz (1Ghz, 1.5Ghz, 2Ghz... Any more power is good!) please reply! :cry:

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you really should get a battery, mate. btw, did you installed null correctly? is it loaded in kextstat?


Yep, it is:

   14    0 0xffffff7f80e1e000 0x2000     0x2000     org.tgwbd.driver.NullCPUPowerManagement (1.0.0d2) <7 4 3>

Sure I should get it... The problem is that my country's currency (BRL) is devaluating so fast that I can't be sure that I can pay for it next month... And even if I buy it from china, it will be a month or two before I get it... The MBP is my sole computer for now, so I'm working super slow due to it's slugness... At least the developer tools I use make more heavy use of ram, so they works, only a bit slow, but they work...

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