You have been subscribed to a public bug: 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 -- fan control goes full speed after sleep https://bugs.launchpad.net/bugs/1861533 You received this bug notification because you are a member of Kernel Packages, which is subscribed to linux in Ubuntu. -- Mailing list: https://launchpad.net/~kernel-packages Post to : kernel-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~kernel-packages More help : https://help.launchpad.net/ListHelp