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Jeroen W. Pluimers on .NET, C#, Delphi, databases, and personal interests

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Archive for March 13th, 2023

Way easier to fix on Intel MacBook machines than I thought: macos kernel_task high cpu dual screen

Posted by jpluimers on 2023/03/13

The links found via [Wayback/Archive] macos kernel_task high cpu dual screen – Google Search were daunting.

In the end, the issue ways way easier to fix than I thought: open up your Intel MacBook (you need pentalobe screwdrivers for that), then with some compressed air, clean the dust (especially from the fans).

This post saved my day [Wayback/Archive] kernel_task takes up 500% of my CPU when plugging in external monitor – MacBook Pro 15″ Retina Display Mid 2015 – iFixit

Things I haven’t tried yet:

  • Cleaning out more free space from HDD
  • Using plain HDMI cable into the HDMI cable port
  • Taking MBP apart and cleaning any potential dust

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I faced the very same issue that you guys are facing and based on input from another forum decided to get my 2016 MPB fans cleaned out.

This made an immediate impact where when I connected my external display to the MBP.pre-cleaning, it would overheat causing the fans to spin at 6000 rpm or thereabout and the kernel_task would eat up 500%-900% of the CPU rending the system unusable.

This simple cleanup of the fans has allowed me to connect the monitor with no kernel panic anymore and even though the fans run around 5000 rpm now the CPU and GPU are running around 10 degrees cooler now.

The same picture is in [Wayback/Archive] macos – MacBook Pro high CPU with external monitors – Ask Different.

An even dirtier MacBook was at [Wayback/Archive] External Display – High CPU Usage – MacBo… – Apple Community.

Links that were interesting but unhelpful:


Read the rest of this entry »

Posted in Power User, Apple, MacBook, MacBook-Pro, MacBook-Air, Mac, MacBook Retina | Leave a Comment »

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