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activating ondemand governor on ThinkPad T21


Playing with my ThinkPad T21 using Debian lenny and Kernel 2.6.22-2-686,
I problems activating the ondemand powersaving governor.

All I get is the following error message: "ondemand governor failed to
load due to too long transition latency".

I found some old hints (speaking of kernel 2.6.17 and earlier), that
this problem could be solved by editing include/linux/cpufreq.h,
replacing the -1 of '#define CPUFREQ_ETERNAL (-1)' with an higher value,
e.g. 10, and recompiling the modules.

Does anyone know an other solution?  Preferably one, where I don't need
to patch and recompile the kernel?

Yours sincerely,

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