[TriLUG] Setting My Processor's Frequency in Ubuntu

[Jason Tower]

Alan Porter wrote:
> Randall Barlow wrote:
> 
>>I like that Ubuntu will scale the frequency of my processor based on my
>>usage, but is there a way to set it to go a certain speed when on
>>battery and full speed when not
> 
> 
> It looks like Ubuntu is using powernowd to control the CPU speed.
> The min and max speeds are specified in:
> 
> /sys/devices/system/cpu/cpu0/cpufreq/scaling_min_freq
> /sys/devices/system/cpu/cpu0/cpufreq/scaling_max_freq
> 
> You can echo your own (kHz) values here.
> 
> The trick is to put different numbers in there when you plug or
> unplug from the A/C.  Is this a job for hotplug?
> 
> 
> Alan
> 

it's more than likely a job for laptop-mode (dpkg -L laptop-mode) which 
also controls things like hdd spindown.

jason