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I have Ubuntu 18.04.3 LTS on a 2011 Imac 27.5. The hard drive was replaced on
this machine immediately prior to installing Ubuntu as the original had a
faulty bearing. When I first boot the machine and use it, the fans all seem to
run smoothly, varying speed depending on the processor load. But if the
machine sits a while or I lock it (Command-L) then at some random interval
after the screen goes dark, the HDD and CPU fans seem to run higher than
necessary and excessively loud. They no longer slow down to normal speed
unless I do a complete shut-down and power back on.
I've tried adding MacFanctld and even telling it to bypass various sensor
readings under watch sensors that seem to give odd/invalid temperatures. but
that seems to have no effect on the problem. (TH0O and TH1O both seem to sit
around 0 to 9C when it's in a 21C room, TL2V, TLAV, ST2P, TS2V and sometimes
TS2P read -128 or +128C) all the cores are running at 33-36C.
** Affects: linux (Ubuntu)
Importance: Undecided
Status: New
** Tags: bot-comment
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fan control goes full speed after sleep
https://bugs.launchpad.net/bugs/1861533
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