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CPU frequency scaling on G4 systems

Hi folks,

With current 2.6.17 and 2.8.16 Debian kernels, the following cpufreq
modules are available:

$ find /lib/modules/$(uname -r) -name 'cpufreq*'

However, loading any or all of these modules does not enable frequency
scaling.  You don't get anything under, e.g.


or under /proc.

What else is needed to get CPU frequency scaling to work?  On other
platforms, there are additional modules under kernel/arch/<arch>, but
this is not the case for powerpc.

The system in question is a Mac Mini (7447A).


  .''`.  Roger Leigh
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