Very weird phenomenon with nvidia-smi

something very weird is going on with my nvidia-smi

It uses high power, full fan speed, but I am not using any single one of it.
No process is running… any clue?

So frustrating since I tried a lot of driver versions and OS versions… (repeatedly formated my hard drive for this…)

It seems like this happens only when I use byobu for training… I have no idea why…