I recently installed Kubuntu 12.04 on a partition of my hard drive and the CPU fan seems to be constantly running. I thought it might be because it was running hot but the temp is floating around 110 degrees F with a load of around 2-12%. I also though the CPU might not be scaling and running at full speed all the time, but that is not the case either. I have the cpufrequtils installed and set to ondemand.
As a test I logged into windows to see the differences, in W7 the temp and load is about the same, but the fan does not run constantly.