The best we can do for reducing fan inactiveness time is to During this process every 7 second, fan will be stopped completelyįor 2 second before spins again for another 7 second until the whole procedure is over. Lenovo Energy Manager's default Dust Removal procedure takes 2 minute to complete. This software communicate to the EC through Lenovo ACPI-Compliant Virtual Power Controller kernel driver and if you're interested you can study the source code.Īt the end this program only periodically active Dust Removal to force the fan to start spinning. So as a last resort, I reverse engineering the Lenovo Energy Manager (old version for Windows 8) software to find how Dust Removal feature of this appĪctually works and build this program with it. For controlling the EC we can change the EC registers to achieve functionality we want,īut for this model and according to its datasheet, I couldn't find the registers which was dedicated to controlling the fan speed. Lenovo IdeaPad Z500 (all variants) uses ENE KB9012QF A3 EC. Therefore if EC pass more voltage to the cooling system, this cause fan to spins at higher speed. Rule 2// The screw holes between the two fans must be 15mm width on the radiator for either 120mm or 140mm UNI FAN.Embedded Controller (EC) is a device responsible for feeding other parts of the system the electric voltage they need. Rule 1// The tubes of the radiator must avoid the tenon of the UNI FAN and be at the safe area, which is in grey in the image.
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