I try to lock my CPU to a specific clock frequency (1.2 GHz).
Using Ubuntu (14 or 15), it works perfectly by editing the
/sys/devices/system/cpu0/cpufreq/scaling_max_freq with the specific Hz-value (e.g. 1200000). And the same for cpu1, cpu2, cpu3, cpu4.
However, for some reason, elementary OS ignores the settings made within the files and puts them back to stock after a reboot.
Also frequency-settings made with the tool TLP aren't recognized by elementary OS.
I'm using an Lenovo Thinkpad T430s with a Intel Core i5-3320M (with Intel pstate driver).