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userspacegovernor to use specific frequency for a specific CPU core. What I suggested (in an answer which should be deleted soon because it's useless now)sudo cpupower -c 3 frequency-set --governor powersave --min 1200MHz --max 1200MHzwon't work because min/max affect the governor itself, so-c 3has no effect, it will affect all CPUs and lock them to 1.2GHz at all times.