in think they have change driver in your case ( or you can only use intel_pstate )
in my case ( as skylake only pstate possible )
cpupower frequency-info
analyse du CPU 0 :
driver: intel_pstate
CPUs which run at the same hardware frequency: 0
CPUs which need to have their frequency coordinated by software: 0
maximum transition latency: Cannot determine or is not supported.
limitation matérielle : 800 MHz - 4.20 GHz
régulateurs disponibles : performance powersave
tactique actuelle : la fréquence doit être comprise entre 800 MHz et 4.00 GHz.
Le régulateur "performance" est libre de choisir la vitesse
dans cette plage de fréquences.
current CPU frequency: Unable to call hardware
current CPU frequency: 4.00 GHz (asserted by call to kernel)
boost state support:
Supported: yes
Active: yes