Uli Brueggemann wrote:
> I'm running a Core 2 Duo system. With different kernels (up to 2.6.23.1 or
> 2.6.24-rc2) I cannot modprobe acpi_cpufreq or speedsteep-centrino or ...
> So I always get the report "no such device".

You definitely want acpi-cpufreq, not speedstep-centrino... The 'no such
device' message usually indicates that upon querying your BIOS ACPI
tables, acpi-cpufreq found no valid frequency scaling information, which
suggests either freq scaling is disabled in the BIOS or your BIOS has
busted ACPI (in which case a newer BIOS for your board, if available,
might help).

Also, you can boot with the added parameter 'cpufreq.debug=7' to get a
bit more info spit out in dmesg about what's going on when you try to
load acpi-cpufreq. Could give some further insight into what went wrong
and/or verify what I suggested above.

-- 
Jarod Wilson
jwilson@redhat.com