But it's not the only thing. My previous observation was made with my battery 
plugged
on my laptop, with AC/DC power. Another day, without battery, I was very
surprised when I saw that the bios_limit was still stuck to 1.20GHz (!). I 
think it's a BIOS related problem. But fortunately, "processor.ignore_ppc=1" 
boot parameter does perfectly the job. (Phew !!!)

-- 
[maverick] CPU frequency does not scale up unless all cores are in use
https://bugs.launchpad.net/bugs/637845
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