Comment 44 for bug 344252

I was having the same issue so I try this:

$ sudo start-stop-daemon --stop --name cpufreqd

$ sudo cpufreqd -D -V 7

That started the cpufreq daemon and print how the rules were evaluated.
So I find out than the problem is in the temp sensors. The sensors always shows 50ºC (122ºF) which is wrong so the rule selected by cpufreq is not the expected one.