About 3-4 minutes later the dreaded kernel_task high CPU usage starts.State B cures the kernel_task problem by moving power from the left ports to the right. You can see the Thunderbolt Left Proximity temperature sensor rise quickly. He describes the test as follows:State A a USB-C hub (a mouse and keyboard, plus power) and a USB-C HDMI 2.0 adapter, both on the left side. Image via “Adam” on StackExchange showing the macOS kernel_task dominating CPU usageAdam’s graphed test results are too big to post here, but they conclusively show that plugging in power on the right side resolves this runaway state.Not knowing about this issue, I believed it was the apps that came with the webcam that were causing the fans to spin up and the machine to slow down. Again moving power back to the right side, restoring State B, resolves the problem immediately.Ergo, high CPU usage by kernel_task is caused by high Thunderbolt Left Proximity temperature, which is caused by charging and having normal peripherals plugged in at the same time.Oddly enough, I personally ran into this problem a few months ago while reviewing a USB-C webcam. Moving power back to the left side, restoring State A, quickly restores the temperatures and kernel_task again comes back after 3-4 minutes.RAID 101: Discussing Benefits of Software RAID vs. Join Team OWC at Photoshop World from April 20-21! Spacers, Stacks & Swapping: Mastering the Iconic macOS Dock, Part 2 Powered By OWC: Adam Blackstone, Super Bowl Halftime Music Director
![]() ![]() Fix Usb Port For Code Or OtherIt’s the kernel generating a null CPU task for the CPU cores that essentially locks out the CPU’s cores by using the kernel’s task prioritizing to create idle states as often as possible while still processing the instructions (non-idle states) from the software you’re using. I’ve been able to get by with the same battery in my iPhone for 4 years by using my iPhone, using it until the battery is completely dead until it shuts down, then fully charge it (although Zoom on my iPhone still drains it very, very rapidly.)There may be slightly different variations of this practice for different devices and vendors, but generally inside the battery there are several cells and a computer board which allows for load balancing charging and talking with other computer components within the MacOS.Hopefully somewhat frequently (once every few weeks or month) resolves the battery drain issue and at least it’s a step you can try that doesn’t cost anything extra to test.The kernel_task process is what appears when the machine has exceeded its thermal threshold and has to be throttled. You could check your Activity Monitor to look and see what items show high energy consumption.Have you tried a battery recalibration? See if that resolves your problem. Also, rendering videos, compiling code or other services/applications can cause a hit to your battery performance. Alternative to photos for maciTunes Visualizer in conjunction with using a YouTube screen saver seems to prevent the shutdown issue with Catalina & Big Sur 11.2As far as I can tell the shutdown issue with Catalina 10.15.2/10.15.3 / Big Sur 11.2 is a GPU / CPU Firmware related issue. Using a YouTube screen saver that is some what graphically demanding will more often then not prevent the shutdown issue with Catalina 10.15.2/10.15.3 / Big Sur 11.2 Syncing of iPhone , iPod , iPodtouch IPad will stop shutdown after all other applications have been closed. Also been pretty well sorted out this is not a specific peripheral issue Bluetooth , FireWire400/800 , USB 2/3 , USB-C , Thunderbolt 2/3 , with or without displays , with or with out hard drives the shutdown issue with Catalina 10.15.2/10.15.3 persist regardless of the diversity of system setups described.I have MacBook Pro15″ 14,3 same issue since Catalina upgrade & continues with Big SurHave found a few things stop or prevent shutdown issue with Catalina & now Big Sur on my 2017 MacBook Pro 15″ They should have labeled one port specifically for charging the machine so users didn’t end up with poor performance due to thermodynamics.¿Is it Catalina, or something in the MBP itself?I would say Catalina / Big Sur & also thinking Right / Left Charging is a piece of the problemsThere is a mega thread describing the issueIMac keeps crashing after Catalina upgradeThread describes a multitude of models effected new old ……Due to the diversity of systems described here 75 pages worth & else where experiencing shutdown issue with Catalina 10.15.2/10.15.3 / 10.15.4 is not hardware related. No kernel_task either, but the machine becomes unusable from something throttling.So it does appear that using one side for charging, the other for peripherals is the best practice in this case.
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