I checked this on the three HW systems I had around, none showed this behavior. So for your upstream report (and here) it might be very helpful to outline as exactly as possible which HW you use in this case.
** Changed in: lm-sensors (Ubuntu) Status: New => Incomplete -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1856457 Title: Extreme low/high fan1 speed. To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/lm-sensors/+bug/1856457/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs