"cat /sys/devices/system/cpu/cpu0/cpufreq/scaling_available_governors" reveals 
this:
powersave ondemand userspace conservative performance

When I switch through the governors CPU frequencies are actually scaled.
However either max or min are used. I checked
scaling_available_frequencies and there are the same frequencies defined
as with the 386 kernel, where frequency scaling works fine, they are
just never used.

ondemand and performance governor lead to the max frequency used all
time and powersave does lead to the min frequency to be used all time. I
think userspace resulted in min frequency as well.

Still no idea why all this happens.

-- 
Generic kernel does not scale down CPU frequency
https://bugs.launchpad.net/bugs/137252
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