[eqvinox]

It's not selectable:

  /sys/bus/cpu/devices/cpu0/cpufreq # echo -n 'ondemand' > scaling_governor 
  echo: write error: invalid argument

Without touching anything, it's using powersave on my box. It seems to work well enough, both on performance as well as battery life, but that's just my personal experience.

The question that this tool completely fails to consider is that clocking the CPU lower isn't automatically the most battery efficient thing to do, cf. race to idle mentioned above. To me, this sounds a lot like someone on the trough of the Dunning-Kruger curve looked at a problem and wrenched at it without understanding enough of it.