Could anyone please explain what happened to this bug, and why?

This problem occurs with NON-overclocked Core 2 Duo 8500 (3.16 GHz) on a
stock Intel board that does not even support overclocking in the first
place.

Just updating the CPU to a spiffier one (on fully-patched Hardy Heron
x86) brought up the warning dialog box and forced the box to run on 100%
CPU speed on both CPUs, effectively nulling the original upgrade goal
(get a cooler-idling 45 nm technology CPU which still gives you the
extra punch over the previous generation CPU when needed).

Ignoring such a relevant feature on top-end HW and top-end SW (Ubuntu)
seems like a bad idea, especially when same board with Windows works
just fine, even in overclocked situations (based on comments above).

Quick search did not bring up any guidance on how to work around this
using manual config of speedstep, except by minimizing daily Ubuntu
usage on dual-boot boxes.

Installing cpufrequtils did not help either.

-- 
Cpu frequency scaling is limited to stock speeds
https://bugs.launchpad.net/bugs/132403
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