Lenovo Thinkpad L540 - name of the I/O chip that control fan and sensors?

[insomniacno1]

Hi,

Anyone here know the name and model number of the Super I/O chip in the L540 20AU (HM86 EXPRESS CHIPSET)?

I need the information to solve an issue in Linux Mint, where fan is not detected correctly.

If anyone know the exact name of the sensor that show fan speed it would also be great.

I tried looking on my motherboard but can't see it without taking the laptop apart and I really don't want to do that. I asked Lenovo, but they are not answering. I searched google for photos of the motherboard but they were too blurry to read anything, according to Lenovo spare parts for my model is the following :

Lenovo Thinkpad L540 20AUA0F4JP Serial R902K1R2
https://pcsupport.lenovo.com/uu/en/prod ... p/r902k1r2

Motherboard
Lenovo BDPLANAR LPD-1 4600 HM86 N-vPro Y-TPM/AES W8P
Part No 00HM560

substitute
FRU Planar W8S HM86 Y/Exp Y/TPM Part No 00HM562



Hope one of you guys can help me out and thank you in advance.

Jan

[tomodachi]

Hopefully this helps

[insomniacno1]

Thank you for the schematic, but I need the name and model number of the chip itself, I will pass this on to the developer of lm-sensors though The problem is that he in order to have him make an driver for my system, he need that information, and then hopefully it will work

[SMDFlea]

Thank you for the schematic, but I need the name and model number of the chip itself, I will pass this on to the developer of lm-sensors though The problem is that he in order to have him make an driver for my system, he need that information, and then hopefully it will work

Its written underneath the chip in the diagram - EMC2013-2 https://www.microchip.com/en-us/product/emc2103-2

[insomniacno1]

tomodachi and SMDFlea


Thank you for your answer which after a bit more investigation is partly correct, it turns out that the motherboard has Nuvoton NPCE985P I/O chip and that one control the fan, the EMC2013-2 control the sensors which among others show temperature and battery. Problem is that no matter what I try, lm-sensors doesn't detect this chip and therefore my fan is reported to be 0 rpm(it is running and work).

[mon2]

This smbus device is a slave device and should offer an address for the communication (check the datasheet). The sensor software must be made aware of this bus address after which the sensor and fan feedback data can be extracted. If available, place any low cost bus analyzer with smbus support to monitor and study the bus traffic.

[insomniacno1]

Actually the SMBus is used for the sensors, PWM is used for the fan according to this schematic

[mon2]

Can you monitor the fan spin / sensors in Windows?

[insomniacno1]

mon2

I have not used Windows since Wincrap 10 came out, I am on Linux Mint 20.2 cinnamon.

[mon2]

Enter the bios. Can you monitor the fan spin speed? We are only wanting to confirm that the hardware is ok. It is really sounding like that this is a pure software issue.