Sorry you must have misunderstood - I also don't have this stepdown. The
stepdown mentioned relates to what Windows Vista is offering (observed
with the CPU-Z utility). In Ubuntu the machine runs remarkably noisy
which is a major annoyance for me, I am really satisfied with the box
except this crucial point.

When reading through the ACPI documentation I found the hint, that some
DSDT tables distinguish between operating systems, determining what they
will support and what they won't. Examining some links I found this
interesting Forum posting related (but maybe slightly outdated) to the
DSDT problem:

http://forums.gentoo.org/viewtopic.php?t=122145

Analyzing the DSDT of my machine, I also spotted this OS-distinguishing
evaluations in the code mentioned there. When I get my hands on the
machine tomorrow, I will try to use the suggested "acpi_os_name=" boot
parameter, supplying one of the operating systems used in my original
DSDT to see if the behaviour improves. The very annoying fact is that
there seems to exist a setting "enable EIST" in some BIOSes which enable
the speed step features using ACPI, but of course the BIOS in my machine
(and I upgraded to the newest one)  doesn't offer that.

-- 
cpufreq modules missing in hardy and intrepid amd64
https://bugs.launchpad.net/bugs/246434
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