Frequency scaling not working

Ryan Campbell campbellr at
Fri Nov 16 05:06:40 UTC 2007

Hi, I have a santa rosa based laptop ( Fujitsu T4220 convertible ) with 
at 2GHz processor. In Fedora 8 (and the latest Ubuntu, Mandriva, and 
Suse distros) the processor is permanently stuck at 800MHz. Trying to 
manually change the frequency and governor using cpufreq-selector and 
echoing values in /sys does nothing.

An interesting thing that I noticed is that the frequency scaling does 
work for a few minutes after the laptop wakes from sleep, and then goes 
back to not working.

I've run out of things to try and I can't figure out if it is a bug or 
something I am doing wrong.
Has anyone encountered this or have any ideas?


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