Sometime ago, I wrote the blog post How to fix kernel_task CPU usage on Yosemite. This post still receives a great amount of traction, so I wanted to post an update that reflects the covers how to do this on El Capitan.
The process is largely the same, but requires a bit more work due to the changes to the additional security that El Capitan introduced to the file system with System Integration Protection (SIP).
The tl;dr is as follows:
- Boot up the system in Recovery Mode (Cmd+R on boot). Start a Terminal window and run
- Reboot the system as normal and follow the same steps as in the original guide.
- Reboot the system again into Recover Mode and enable SIP by running
- Reboot the system.
Step 1: Disable System Integration Protection (SIP)
First, shut down your computer. Then power the computer on and boot it into Recovery Mode by holding down Command + R.
Once the computer is done booting, bring up a Terminal window (Utility -> Terminal). With that done, simply run the following command:
$ csrutil disable
That will disable SIP. In order for this to work, you now need to reboot your computer into regular mode (i.e. not anoter Recover Mode boot).
Step 2: Fix the issue
Once your computer is booted, stara Terminal session and run the following commands (for more information, see the original post:
# Find the model $ system_profiler -detailLevel mini | grep "Model Identifier:" Model Identifier: MacBookPro8,2 # Move and backup the file $ cd /System/Library/Extensions/IOPlatformPluginFamily.kext/Contents/PlugIns/ACPI_SMC_PlatformPlugin.kext/Contents/Resources $ sudo mv MacBookPro8_2.plist MacBookPro8_2.bak
With that done, it’s time to go back into Recover Mode again, so shut down your computer.
Step 3: Re-enable SIP
Boot the computer in Recover Mode again by pressing Command + R on boot. Again, open a Terminal window, but this time, run the following command:
$ csrutil enable
Now reboot your computer and you should be all set.
Update: If you’re having issues with mac OS Sierra, please How to fix kernel_task CPU usage on macOS Sierra