[Guide] How to control fans on Dell Laptops under Windows

Discussion in 'Dell' started by valuxin, May 27, 2017.

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Does this solution work for you?

  1. Yep :)

    8 vote(s)
    47.1%
  2. Nope T_T

    5 vote(s)
    29.4%
  3. Scared to try :c

    4 vote(s)
    23.5%
  1. schmendrik

    schmendrik Notebook Geek

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  2. Tony96

    Tony96 Notebook Enthusiast

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    I have a Dell 7577 too. It is annoying to hear the fan noise when the laptop just hit 60C.
    How did you use HWinfo64 to control the fan? What is the temp that the laptop finally gets loud after the fan control?

    /Edit: Did some research and I just found the Fan Control Look-up Table (HWinfo64 -> Sensors -> Continue -> hit the icon Fan -> Custom Auto).

    My temperature right now is 45C - fan speed at 2500 RPM (10 chrome tabs is open). The laptop is really quiet. But in the Look-up Table I saw that if the laptop hit 60C, the fan would increase right up to 4900 RPM (maximum speed).

    A little nervous to try and change the fan speed. Should I disable EC control first, then change the fan speed according to the temp and that's it?
     
    Last edited: Feb 2, 2018
    Maleko48 likes this.
  3. Stev3FrencH

    Stev3FrencH Notebook Enthusiast

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    I just picked one of these machines up and man is it loud. I tried this but I am wondering if there is a way to unlock fan control in the bios? Has anyone tried figuring this out?
     
  4. SaintBahamut

    SaintBahamut Newbie

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    Have you tried using Intel Dynamic Platform and Thermal Framework thing?
     
  5. vilo76

    vilo76 Newbie

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    Hi folks,

    I've compiled a command line tool based on software provided in the OP.
    You can use it to auto disable EC at Windows startup.
    I personally use it in conjunction with SpeedFan (advanced fan control), and I'm very happy of the overall results.

    Could have been almost perfect if Dell had allowed us to control fan pwm with more than 3 levels.

    By the way, I've discovered that on my 7577, GPU fan (FAN #2 in Speedfan) was quieter than CPU fan, so this is the one I kick in for low T°C.
    My current fan curves are :
    GPU fan (fan #2) : 0% until 65°C / 50% until 80°C / 100% above (with 15°C hysteresis)
    CPU fan (fan #1) : 0% until 70°C / 50% until 80°C / 100% above (with 10°C hysteresis)

    At office, making dev + net, CPU package oscillates between 45°C and 63°C with GPU fan @50% all time (with -135mV on 7700HQ and -100mV on HD630).
    GPU fan never turns off but this is intended, for I much prefer having a constant very low noise than an intermittent "kicks in" noisier fan.

    Don't know if I'm allowed to do so, but if you are interested : https://drive.google.com/open?id=1zjsFyCC0LFZNA6w924oBz2mmrOmJxwLQ

    You have to put OP "bzh_dell_smm_io_x64.sys" (or x86) side by side with my EXE.
    Of course, EXE needs admin rights, and driver signature turned OFF ;-)
     
    Last edited: Feb 21, 2018
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  6. kweniston

    kweniston Newbie

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  7. vilo76

    vilo76 Newbie

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    I'm afraid no, this is software problem.
     
  8. kweniston

    kweniston Newbie

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    Is it not both? One are the temperature tresholds at which the fans change speeds (software), and the other that the pwm for the fan control is limited to 3 settings at this moment, 0/2500/4900 rpm (i.e. a hardware issue)? With a 4rd pwm setting, i.e. 3500 prm fan speed, we could also be helped...
     
  9. vilo76

    vilo76 Newbie

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    As I understand it, fan hardware is not the culprit.
    If a Fan is PWM compliant, its RPM will react almost linearly with PWM input.
    The problem is that Dell driver does not react linearly to PWM values that our software send to it.
     
  10. kweniston

    kweniston Newbie

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    Ah ok. This driver cannot be replaced by 3rd party one, one which is able to control the PWM more adequately?
     
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