[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. vilo76

    vilo76 Newbie

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    Maybe some specialist could dig deep into drivers to find a way to directly pilot FANs ...
    But as far as I know, actual control is made by sending PWM command to internal piece of hardware that controls FANs.

    And this is this piece of hardware that do not allow a fully linear control.

    The default Dell FAN manager is implemented into the BIOS (or another HW component), thus having a more direct access to FANs, and thus being allowed to control RPMs more precisely.
    Dell FAN manager is able to set FANs at 2200rpm on my 7577, value that neither SpeedFan nor HWinfo64 can achieve (min value is 2500rpm at 35% PWM).
     
    kweniston likes this.
  2. KopaZ

    KopaZ Newbie

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    I think this is my first post on the forum. Sorry, but I've been lurking a lot :(
    I dug into this stuff for like few hours and found out dell's CCTK; there was a command lind tool/exe that allows you to enable/disable settings in BIOS through the exe.

    the options that are relevant to this stuff (disabling fan control/fan speed control) seems to be fanctrlovrd and fanspeed.
    typing "cctk --fanctrlovrd disable" (disables fan speed control) gives you "usage error" output; also typing "cctk --fanspeed low" gives you same error message.
    most importantly, doing cctk --fanspeed and cctk --fanctrlovrd gives you error message called:
    "This option is not available or cannot be configured through this tool: fanspeed/fanctrlovrd".
    I think the option is locked out in BIOS, can anybody try this through dell's CCTK and see if it works?
     
    Maleko48 likes this.
  3. Maleko48

    Maleko48 Notebook Evangelist

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    Has anybody tried using a memory or hex editor to locate the value being pushed to control the fans and modify it live? I remember using those to "hack" (more like Game Genie really) computer games back in the day.
     
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