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If a mechanism is controlling fan speed dynamically there must be a processor involved especially if it is PWM. Is BIOS the code regulating this and does a temp sensor ...
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  1. #1
    Linux Newbie theKbStockpiler's Avatar
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    How does the Motherboard CPU fan controll work?




    If a mechanism is controlling fan speed dynamically there must be a processor involved especially if it is PWM. Is BIOS the code regulating this and does a temp sensor interrupt the CPU to run the code? Is there a Micro controller on the board so the CPU is not involved?

    Thanks in advance!

  2. #2
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    Hi,
    First of all I'm not an expert.
    Here some basic thoughts:
    PWM Pulse wide modulation
    equals turning something on and of within nano, mycro or milli secounds.
    There's no need for a micro-controller ... but it's the easiest way for a controller to simulate an analog output or have a "rough" control over a fan.
    If I have to guess the PWM is made by a chip of the Motherboard ... also the counting of the fan-speed should be done by an MB-Chip ... and not by the CPU itself.

    The time of the CPU is much to precious for such tasks in my opinion.
    (especial since you need counters for this task)

    So there should be a controller for these tasks, giving the CPU the possibility reading and setting some parameter ... but the CPU itself has nothing to do.

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  5. #4
    Linux Newbie theKbStockpiler's Avatar
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    Thanks for you input!

    I'm inclined to believe that the CPU is not involved with fan control; and a micro controller that controls it, must be on the motherboard itself. I have not been able to find any info that directly explains this.


    Thanks for the Replies and feel free to add to this thread.

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