kernel – Ubuntu 20.10. Cannot change the CPU scaling governor. It always goes back to “ondemand” after reboot

I’m running Xubuntu 20.10. I’m trying to change the CPU scaling governor to “conservative”. But it always goes back to “ondemand” after reboot.

I have a Ryzen 7 4800H. So, my CPU scaling driver is acpi-cpufreq. The kernel is 5.8.0-40-generic

I tried with

# sudo cpupower frequency-set --governor conservative

# for GOVERNOR in /sys/devices/system/cpu/cpu*/cpufreq/scaling_governor;   ─╯
do 
    echo "conservative" | sudo tee $GOVERNOR; 
done

# sudo cpufreq-set -c 0 -g conservative 

Without success in any case. That’s very hot…

Do anybody knows what happen?