MacBook Pro (15 inch, end 2013) with MacOS Sierra 10.12: kernel_task maxing out CPU with external display

I have a maxed out end 2013 the MacBook Pro Core i7 to 2.6 GHz, 16 GB of DDR3 RAM, 1 TB SSD, NVIDIA GeForce GT 750 M 2048 MB, Intel Iris Pro 1536 MB.

Also, I have a DELL P2415Q Display 24 inches (3840 x 2160) using Thunderbolt, are involved through the headphone jack and use a USB for lightning to recharge my iPhone.

I upgraded to macOS Sierra the day he is released and had no problems until this morning. I unplugged my external screen and speakers and used my laptop for about 15 minutes, the battery, and then returned to my office and plugged my Thunderbolt, rear speakers display in and my CPU shot at 100% and never came back down. My Mac is essentially useless because kernel_task is eating all my CPU and to prevent another asks to enter the CPU.

I have since audited equipment - everything was fine, reset the NVRAM and I tried to erase IOPlatformPluginFamily.kext .plist files but I couldn't on my Mac (trying to follow this guide, started in Safe Mode and everything then went to try and find the file and my Mac just does not have it). When my external screen is plugged if I'm doing anything CPU intensive (videophone, opening of Chrome, etc.) then my kernel_task gets mad again, and the only way to move is to unplug my screen. Connect my iPhone to charge the tips also my kernel_task as well. I followed my internal temperatures, and nothing was out of the ordinary, to cold currently at about 140 °.

At this point, it seems that any time that puts something on the charging system and increase the temperature internal internal components of my Mac kernel_task maxes my CPU, which brings my Mac to its knees.

Any ideas how to fix? Is this just a major bug in 10.12?

Hi, Trent L.

Try this - problems with macOS Sierra? This fix can help you.

He got rid of all my macOS strangeness of the Sierra.

Hope this helps,

-BrainSel

Tags: Mac OS & System Software

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