I've got three Intel CPU machines here, all running Jaunty with kernel
2.6.28-11-generic.

On the Intel(R) Core(TM)2 CPU 6400 @ 2.13GHz (Dual Core PC) I get:
 find /sys/devices/system/cpu/cpu*/cpufreq
find: `/sys/devices/system/cpu/cpu*/cpufreq': No such file or directory

On the Intel(R) Atom(TM) CPU N270 @ 1.60GHz (eeeBox) I get:
 find /sys/devices/system/cpu/cpu*/cpufreq
find: `/sys/devices/system/cpu/cpu*/cpufreq': No such file or directory

On the Intel(R) Core(TM)2 CPU T7200  @ 2.00GHz (Dual Core Laptop) I get:
 find /sys/devices/system/cpu/cpu*/cpufreq
/sys/devices/system/cpu/cpu0/cpufreq
/sys/devices/system/cpu/cpu0/cpufreq/cpuinfo_min_freq
/sys/devices/system/cpu/cpu0/cpufreq/cpuinfo_max_freq
/sys/devices/system/cpu/cpu0/cpufreq/scaling_min_freq
/sys/devices/system/cpu/cpu0/cpufreq/scaling_max_freq
/sys/devices/system/cpu/cpu0/cpufreq/affected_cpus
/sys/devices/system/cpu/cpu0/cpufreq/related_cpus
/sys/devices/system/cpu/cpu0/cpufreq/scaling_governor
/sys/devices/system/cpu/cpu0/cpufreq/scaling_driver
... and so on, cpufreq works fine!

CPU frequency scaling only seems to be supported only on certain CPUs in
jaunty.

-- 
cpu frequency scaling not supported after upgrading to 9.04
https://bugs.launchpad.net/bugs/365798
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