As I understand it, each core is logically scaled seperately but the
hardware itself is set to the minimum frequency needed to meet the
maximum frequency of both cores.  This means that if frequency scaling
is not enabled for one of the cores the minimum frequency is pegged at
the frequency of the non-cpufreq core.  The other core will appear to
scale, but in fact never does.  This is NOT merely cosmetic! :-(

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Intel Core 2 Duo - Resume from suspend, CPU Frequency Scaling is gone on CPU1
https://bugs.launchpad.net/bugs/183033
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