[   50.968608] ondemand governor failed, too long transition latency of
HW, fallback to performance governor


/*
 *  drivers/cpufreq/cpufreq_ondemand.c
 *
.....

 * For CPUs with transition latency > 10mS (mostly drivers with CPUFREQ_ETERNAL)
 * this governor will not work.
 */

There is NO choice for "ondemand" power management (ppc G4) other than
user space / powernowd. But thanks for your interest, it's really not
that hard to maintain the last powernowd release outside of Ubuntu.

-- 
powerpc: powernowd init script intentionally ignores ppc for loading cpufreq 
modules
https://bugs.launchpad.net/bugs/192677
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