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How do you change the governor from Ondemand to something else ?

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The appropriate cpufreq module probably isn't loaded into that machine. Compare the output of lsmod on the broken machine against a similar machine where cpufreq is working to see what module(s) you need to load for your system.

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Check with modprobe -l which module you can load.

Check in /sys/devices/system/cpu/cpu0/cpufreq/scaling_governor which governor is running.

If you want to change the governor, load the module and change the sys file:

echo "governor" > /sys/devices/system/cpu/cpu0/cpufreq/scaling_governor
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