cpufreq: shouldn't scaling_min_freq be lower?

[bettlert]

I'm running a two year old Thinkpad R32. P4-M 1.8 GHz.

In the beginning there was a Windoze on it. The cpufreq varied from 1800 to
120MHz

When I didn't run X, I also observed sometimes (don't know why) the freq
dropping down to 200MHz on Linux 2.6 kernel some months ago.

Anyway ACPI works like that:
/sys/devices/system/cpu/cpu0/cpu_min_freq: 1200000 (1.2G)
/sys/devices/system/cpu/cpu0/cpu_max_freq: 1800000 (1.8G)

How can I control the cpufreq below cpu_min_freq
I would like to get this feature handy, for longer battery runtime. Is there
an possibility to manage this?

Thanks for all you help.

If you need further info, just call for it.

[Earthwings]

You can use ACPI throttling for lower frequencies, but it won't give you longer battery runtime. It's only useful to keep your CPU cool (same in MS Windows of course). See the power management guide on gentoo.org for details on setting up throttling if you still want to enable it.