Linux 4.4 and Phenom powersave

I tried to make my old Phenom II X4 B50 be more power friendly with the newest ubuntu 16.04 but the CPU’s were stuck at 3.2 GHz.

Cpufreq-set did not report errors, not it did not do the change (never happened me before). I googled a bit and Linux 4.4 is using acpi-cpufreq driver and not the old k6-driver. Also, the power modules are integrated into kernel now, so no unloading the acpi-cpufreq anymore. Cool’n’Quiet was turned on at bios-level so frequency scaling should work.

Luckily I looked at system settings; scaling_min_freq setting and for some reason, it was the max frequency available. By writing the lowest frequency available to the processor, the processors finally went into lower frequencies.

—–

echo 800000 > /sys/devices/system/cpu/cpu0/cpufreq/scaling_min_freq
echo ondemand > /sys/devices/system/cpu/cpu0/cpufreq/scaling_governor
echo 800000 > /sys/devices/system/cpu/cpu1/cpufreq/scaling_min_freq
echo ondemand > /sys/devices/system/cpu/cpu1/cpufreq/scaling_governor
echo 800000 > /sys/devices/system/cpu/cpu2/cpufreq/scaling_min_freq
echo ondemand > /sys/devices/system/cpu/cpu2/cpufreq/scaling_governor
echo 800000 > /sys/devices/system/cpu/cpu3/cpufreq/scaling_min_freq
echo ondemand > /sys/devices/system/cpu/cpu3/cpufreq/scaling_governor

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