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AMD64 e-machines 680x - cpu descaling

Not really a 64 bit question, but relevant:
My current kernel, which allows cpu frequency scaling while on wall power, insists on stepping the frequency down to minimum when on battery. I am unable to step it back up again, when I want to run at full performance while on battery. Other than building a kernel without scaling support, how do I insist on staying in fast mode ? What am I forgetting ?

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