Shouldn't this no boot/cpu governor thing be investigated with utmost priority?
I've just updated one of my E8450s to 23.05 (from 22.03). In 22.03 the CPU governor was "userspace" and freq never dropped below 1350MHz. As soon as I flashed it, governor was "ondemand" and idle freq dropped to 400ish MHz. As a precaution, I increased the minimum freq to 600 MHz as suggested above, but I wonder what is the point of doing that after boot and the issue manifests itself before OS has booted?