I've been struggling with this kernel_task issue
I've been struggling with this kernel_task issue.
I Looked for all information that I could find on Google and did not pay much attention to something on a document that suggested non original hardware installed.
I realized that even though my battery seemed working working fine, it was not from the fruit brand (trying to avoid your anti spam robot guys).
I've been monitoring all sensors that iStats could provide for my machine and worried about GPU Dies and wireless controller IC showing a dash or a low weird value but, the thing that did the trick was to simply unplug the battery and run it on power adapter.
Each machine may behave in different ways but maybe you forgot that your battery was replaced by a "compatible" long time ago that happens not to be so compatible with High Sierra anymore unless you delete the plist file many documents that can be found about this issue...
May this experience be of any help to others.
Update (07/06/2018)
Hello Dan! Thank you for your answer.
In brief, installed OS High Sierra from Scratch, erasing HDD first. The situation was: starting the system will be fine till random times from 5 min to 1 hour when kernel_task started eating CPU up to 100% making system unusable, very slow cursor, etc. specially running on battery power. More stable but still it may happen when charging. In safe mode seemed okay.
Weird sensor values I mean low GPU Die Analog temperature on both integrated and discreet GPUs. Reading up to 50°C when running Heaven Benchmark. GPU Die digital will stay "-" and Wireless Controller IC as well.
Close the lid, leave it closed a few minutes, open it again and got some 5 or 10 minutes normal operation. All temperature values normal between 25°C (battery) and up to 80°C CPU (average 41). Changed thermal compound CPU and GPUs Arctic MX4. Disassembly main board and cleaned with printed circuit cleaner including connectors.
Did shift+ctrl+option power for 10 seconds or more and cleared NVRAM.
One week with this situation after clean High Sierra installation. I've been working with it the whole day without battery without any problems so far. Reconnected and changing battery while posting and capturing screen shots and running for more than one hour without issues so far.
What did the trick I dunno but I will keep testing...
Thank you once again and best regards from Spain!
PD: Sorry for the typos, this Mac has an AZERTY French keyboard I don't get used to and I've been told hard to change because that would mean tearing the whole thing appart... ;D (saw already the tutorial)
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