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The speed of my CPU fan it's out of control, going to the fastest speed and lowest without any reason.

I have tried the following without success:

  1. Changing fan speed in UEFI settings and setting other speed parameters.
  2. Installing sensors, detecting it, and installing fancontrol
  3. Reinstalling UEFI firmware and Ubuntu.
  4. Other monitoring programs, such as psensors, htop, tlp, etc.
  5. Changing the connection of the fan between cpu_header and opt_header

Are there any programs, commands, whatever to control my fan speed in Ubuntu, or to make my UEFI firmware work correctly, as I can't see the fan speed with sensors or other monitoring software...

Here is my hardware setup:

  • Motherboard: ASUS ROG STRIX X399-E GAMING
  • Fan: Cryorig A40 Ultimate
  • CPU: AMD Ryzen Threadripper 1920x
  • OS: Ubuntu 18.04

Update with more info:

  • All the hardware is new except the SSD, and I have reinstalled Ubuntu from scratch after changing the hardware.

  • The Fan and the motherboard have both 4-pin.

  • I never cleaned the fans, because they are new.

  • One time, I could configure the fans correctly, and it worked! But after run a heavy algorithm (I'm a data scientist) that require the 100% of all cores, during the processing, the config stop to work and even at 78º CPU the fans goes slow. If I disconnect, restart the BIOS from zero, etc. I think that I can come back to my config, but I'm running heavy algorithms all day, so it doesn't make sense.

  • Other times I can at least configure in a range from 98% of the speed to 100% of the speed and it works with heavy algorithms (100% CPU use), but it's very noisy 98% of the speed when you are just programming. The change that I did was change from CPU_fan connector to CPU_opt connector

  • The version of my UEFI is updated to the last version, ROG STRIX X399-E GAMING BIOS 1203. On November 2019

My speed/temperature set up is for a maximum speed of 2200 rpm. (I changed these parameters a lot.)

  • Low fan: less than 35º -> 30% of speed
  • normal fan: 56º -> 60% of speed
  • high temperature: more than 63º -> 100% of speed
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  • Have you swapped fans recently or did this just start happening on fans that support PWM [4th pin]? Have you cleaned the fans and heat sinks of any dust/dirt that's collected on them [dust filters if applicable]? Does this occur under any use (i.e. regular PC usage or just under heavy load/gaming)? What is the fan speed set to in the UEFI firmware (i.e. Smart Control or Speed 1 -10), and what temperature is the fan speed you have set in UEFI set to?
    – JW0914
    Dec 19, 2019 at 14:02
  • Thanks, @JW0914 I updated my question :)
    – Rubiales Alberto
    Dec 19, 2019 at 14:55

1 Answer 1

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So finally I found a solution.

I just changed the fan conecction to the Water Pump conector and after a litle configuration in the UEFI everythings works correctly.

My personal understanding and knowledge about motherboards was that, the Water pump is for a full speed fan and it's imposible to control. But definitly is not like that in this UEFI. So I can create a speed configuration. More temperature -> more speed

I leave here this answer in case anything like this happens to anyone.

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