Laptop fan always on with AC, not always on with battery, despite being configured

Question

My laptop occasionally gets somewhat hot, so I've configured my power plan in Windows 7 so that the fan should always be on whether powered by AC or battery.

However the fans don't always run when the system is battery-powered, only seeming to be on when the system wants (or when there is AC power). Is there another setting I need to change to get this to work?

/It`s a HP 625 notebook.

Solution

Windows actually specifies two methods of cooling policy: Active and passive. To go to this screen, Choose power options (in control panel) -> change plan settings -> change advanced power settings.

Active means the fan speed is increased before decreasing the processor state. Passive means the processor state is decreased before increasing fan speed.

Occasionally, program like "thinkpad fan control" and "aa1fancontrol" (for thinkpad and acer aspire one respectively) exists. Usually these are due to having enough hackers using these laptops but the reason behind is usually due to the fan being too noisy. <p flamebait="1"> I doubt, that there are currently enough hackers using HP to get this done... </p>

Comments

[Apache]

Laptop... what laptop? Manufacturer? Model?