I've an Inspiron 1564 with Core i5-430M, 4GB RAM, 500GB HDD, Ati 5450 VGA and I experienced bad fan control with my notebook.
My CPU's (Core i5 firstname.lastname@example.orgGHz) temp. in idle 47-49 °C and the fan is running at 3200RPM (very noisy) w/o using any programs. If I use some apps (ex. Word, Excel, Opera, FireFox) CPU's temp raises to 50-55°C and the fan is spinning up to 4000RPM and unbearably noisy. All of the drivers are latest, and the diagnostics don't show any error. But I think this is abnormal!!
My fan is always works. I think this function cannot be expected. This is an $1000+ machine.
Please DELL fix this horrible faulty fan control!!