I have a problem after upgrading to 18.04 - even if CPU is idle fans are still working. Everything was fine on 17.10 (fan would only work on higher loads) then

I have a problem after upgrading to 18.04 - even if CPU is idle fans are still working. Everything was fine on 17.10 (fan would only work on higher loads) then upgraded on my ultrabook to 18.04 and fan is working all the time. Anyone have similar experience/solved that?