Since I have upgraded my MacBook Pro to the new OS, when it is unplugged, the Mac slow down and the Cpu usage is from 120 % to 300 % ( the process is Kernel Task).. What can I do?
Thanks a lot
MacBook Pro (13-inch Early 2011), OS X El Capitan (10.11)
I just started having this problem -- kernel_task is using around 250% CPU. Can it be due to running the computer with no battery at all? Surprisingly, I don't hear the fan going.
I took my 2011 MacBook Pro to an authorized service provider to get the battery replaced (the computer was shutting down at 30%). They didn't have a replacement battery, but the tech noticed that the battery was swolen, and wouldn't put it back in because he said it could start leaking and damage the computer. He said it would be OK to run on AC.
I did an SMC reset yesterday (before removing the battery today -- I was on chat with Apple Support and they recommended it when we were doing initial trouble-shooting of the battery depletion problem).
Should I try BadgerMonkey's procedure?
just to say THANK-YOU Badgermonkey! 🙂
working on a MacBook Air (13-inch, Mid 2011) El Cap swapped the battery out (initially for another used one, just to charge it) and the computer went into SUPER S L O W mode 😮
couldn't figure out why, never seen this before 😕
wouldn't boot off USB, wouldn't clean install off USB.
Finally clean installed via Thunderbolt & Target Mode but still wouldn't run at normal speed under its own steam.
Would ONLY boot in safe mode and run fine.
stumbled upon your post...
removed MacBookAir4_2.plist
and BOOM! my problem solved 😮
THANKS AGAIN!
MacBook Air (A1369), macOS Sierra
I've followed your steps but my activity monitor still shows kernel_task using about 500MB of RAM. Someone knows why? Should I be worried?
Thanks.
Thanks Linc Davis for the reply! I have reset the NVRAM and I have done the Apple Hardware Test (AHT) and there's an error ( code 4SNS....).. What is this? It is an hardware problem?
Thanks
It is an hardware problem?
Yes. The logic board is faulty.
Thanks for the reply Badgermonkey! I have resolved my issue 🙂 Thanks!
I'm doing something wrong. I copy the file macbookpro8_2.plist to a folder, restart, and still having problems. Kernel task still using over 500%. Wth!?!?
I Have a macbook pro 15 early 2011. 2Ghz core i7. 4gb ram. computer is very slow. track pad cursor is jumpy. Slow to respond to any commands. Bought the computer used recently. Running os 10.11.
Open Activity Monitor, select View all processes - What's using most of your CPU?
Kernel task
This is what my machine was doing, Kernel Task was using 900%(?) processor with nothing connected to my 2011 MBP. I first had this issue with Yosemite too, and this fixed it.
Same here. I'm only able to copy it to another folder. It still remains. Reeeeeeally frustrated!
Follow my instructions on booting into recovery mode and disabling file protection.
Did the solution I posted not work for you?
I have a MacBookPro11,3. Unfortunately this identifier does not exist in the Ressources folder.
The highest number is MacBookPro8_3.
What should I do?
Problem with Kernel Task - El Capitan
