Those panel things could work, sometimes you need to set up policy rules
or to set an evil bit ;), aka suid.

I use the command line, resp. scripts, without tools, so I don't need to
care for distro specific commands:

$ grep performance /sys/devices/system/cpu/cpu*/cpufreq/scaling_governor
/sys/devices/system/cpu/cpu0/cpufreq/scaling_governor:performance
/sys/devices/system/cpu/cpu1/cpufreq/scaling_governor:performance

$ echo -n ondemand | sudo tee 
/sys/devices/system/cpu/cpu*/cpufreq/scaling_governor >/dev/null

$ grep -v performance /sys/devices/system/cpu/cpu*/cpufreq/scaling_governor
/sys/devices/system/cpu/cpu0/cpufreq/scaling_governor:ondemand
/sys/devices/system/cpu/cpu1/cpufreq/scaling_governor:ondemand


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