Comment 25 for bug 1188647

@Phillip: Tell us more about what you trying to do and how you are doing it.

I assert that the "control knobs" work fine, however, I only use primitives to control it and never any higher level tool.
For example, I would limit the maximum CPU frequency to 0.75 of maximum with:

echo "75" | sudo tee /sys/devices/system/cpu/intel_pstate/max_perf_pct

(If I was in performance mode and not powersave mode, then I would set the min_perf_pct to 75 also, but I myself I wouldn't be in performance mode for this situation.)