IL_DECAMERON

I quote from the datasheet: "The EMC2103 communicates with a host controller, such as an SIO, through the SMBus. The SMBus. is a two-wire serial communication protocol between a computer host and its peripheral devices ". Interesting information on the fan control is on page 57 http://ww1.microchip.com/downloads/en/DeviceDoc/20005250.pdf

According to the scheme of the motherboard controls the fan EMC2103 ... Might be worth looking in this direction? The link you can download a schematic diagram of Lenovo Y580. See page 39. https://cloud.mail.ru/public/4kTW/5bVYBrQQQ

Registers on pages 167 and 168 is likely to relate to the clock generator (PLL).

To do this, you need to know the values of any controller registers changes Energy Management ... Unfortunately I have no experience in programming. Perhaps the datasheet of the controller will be able to clarify the situation. KB9012QF controller. Datasheet file is too large to attach to the forum.

Unfortunately I also did not reach the maximum speed ... The fan speed is controlled by PWM. With my settings when running clean from dust using Lenovo Energy Management, Notebuk Fan Control shows the fan speed is 120%. So maybe it should be?

I experimented with the RW-Everytning and Notebook Fan Control. Fan speed control register 95. The data on the fan speed can be read from the register 06. Fan notebook has 3 stages of work: ~63% (less than 65 ° C), ~83% (more than 65 ° C), 100% (more than 80 ° C). Attached is my configuration file Notebook Fan Control for Lenovo Y580. Perhaps someone will be able to understand in more detail in this issue. Sorry for my English))) Lenovo IdeaPad Y580.xml