Armsom-sige7 thermal_governor missing on armbian

General
1

installed Armbian ubuntu jammy on a ArmSoM-Sige7, I would like to set the working mode of the small fan on top of the Rock CPU.

2 
sudo su
set_thermal_governor() {
    local new_policy="$1" i
    for i in /sys/class/thermal/thermal_zone*/policy
    do
        echo "$new_policy" > "$i"
    done
}
set_thermal_governor step_wise