Hi,

I've been trying to get the acpi_cpufreq working on my Panasonic 
Toughbook CF-18 (Intel Pentium M 1.2GHz). It works just fine on my CF-19 
(Intel Core Duo U2400) just fine.

When I am on wall power, the system runs at full speed (1.2GHz) and when 
I pull it off wall power it steps to 600MHz and nothing I have tried 
changes that. I need to be able to run full speed while on battery.

I am running a vanilla 2.6.25.4 kernel. This was also an issue on 
2.6.24.2 (my previous kernel). I have included the full config, but 
basically, I've got cpufreq turned on with the performance governor set 
as default.

I see the stubs in /sys/devices/system/cpu/cpu0/cpufreq as expected. I 
even set the scaling_min_freq to 1200000 (the same as the 
scaling_max_freq) to try to force the cpu to stay at its maximum speed, 
but it does not change the reported scaling_cur_freq / cpuinfo_cur_freq 
at all.

The cpufreq-info utility seems to work normally, but does not affect the 
actually CPU speed at all. I've attached two examples of the script 
running on and off ac power.

I've double checked that the CPU really is downstepping by running the 
attached prime number factoring script. It completes in 8 seconds when 
on wall power and 16 seconds when on battery.

I'm stumped at this point. Can anyone help?

Tony