T480, Debian. After resuming from suspend the fan runs flat out until reboot. Sensors show normal temperatures. Anyone seen this? Happens maybe one resume in five.
ThinkPad fan at full speed after suspend
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Had this on a T470. Reloading the thinkpad_acpi module after resume fixed it for me, put it in a systemd sleep hook. Never found the root cause.
Mine did this until a BIOS update. Check the Lenovo release notes for your model, there was a thermal fix for several of them. Not saying it's your problem, but it's a cheap thing to try first.