Driver responsible for CPU fan control?

Discussion in 'Windows Vista General Discussion' started by Markus Eßmayr, Mar 23, 2009.

  1. Hello,

    since a few weeks I have the following problem with my Notebook.
    (Toshiba Satego X200)

    If I start it the first time (with cold CPU), the fans initially don't run.
    But even after Windows Vista started, and the CPU is "warm enough", the fans
    don't start.
    But it I reboot the Notebook, as soon as the POST runs, also the fans start.
    Then, also if Windows is up, the fans keep on running.

    Is there some kind of driver in Windows, that may have influence on CPU fan
    It's very annoying to boot twice each day!

    Markus Eßmayr, Mar 23, 2009
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  2. Markus Eßmayr

    Malke Guest

    No, this isn't caused by a driver. When the computer is first turned on (and
    the fans don't initially run) there is no operating system loaded and hence
    no drivers running.

    You have a hardware issue. It is common for hardware to exhibit the symptoms
    you report - it doesn't work when cold and then it warms up, the metal
    expands, and connections are made so now it works - and vice versa.

    Since you have a notebook computer, contact Toshiba tech support for

    Malke, Mar 23, 2009
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  3. Malke,

    thanks for your answer.
    I'd like to add, that the fans worked normally for about 1 year now.
    Just in the last weeks there must be a change somewhere.

    Here is an info, that might be important.
    When I upgrade to the newest BIOS, the fans start when powering on the
    system, but stop as soon as Windows starts.
    So I absolutely believe that something loaded by Windows modifies the fan

    After downgrading the BIOS the fans behave like I initially posted.

    Does this change anything?

    Markus Eßmayr, Mar 23, 2009
  4. Markus Eßmayr

    Malke Guest

    Probably not. Although there is a possibility that Toshiba's power
    management software is the culprit once Windows starts, it is more likely
    to be a motherboard issue. The BIOS upgrade apparently fixed part of the
    problem (and again, no operating system is booted when you first turn on
    the computer) but not all of it. Contact Toshiba tech support. It would be
    great if it turned out not to be an actual hardware failure and another
    BIOS upgrade or a patch for their power management software would solve the
    issue, but really the Toshiba techs (and not bottom-tier ones) are the only
    ones who can address this.

    Malke, Mar 23, 2009
  5. I suggest you send the laptop in for repair.

    For one year you had no problem. Then because of aging lubrication (maybe
    got thicker or dried out) the fan doesn't run until the computer has gotten
    warm enough to begin to liquefy the shaft lubricant.

    This is a common scenario with desktop computers but, unlike a desktop
    computer, YOU can't just replace the fan.


    Richard Urban
    Microsoft MVP
    Windows Desktop Experience

    __________ Information from ESET NOD32 Antivirus, version of virus signature database 3954 (20090323) __________

    The message was checked by ESET NOD32 Antivirus.
    Richard Urban, Mar 23, 2009
  6. You CPU fan is most likely bad. Is this computer still under warranty
    Computer/Software Expert

    Charles Richmond

    "And In The End... The Love You Take, Is Equal To The Love You Make"
    The C. [MS MVP], Mar 24, 2009
  7. Just because this cowboy places a link to the MVP web page beneath his name
    does ***NOT*** mean he is, in fact, an MVP.

    All indications are that he is <<<<NOT>>>>

    Until he posts a link to his official MVP profile do not believe his <<<SELF


    Richard Urban
    Microsoft MVP
    Windows Desktop Experience

    __________ Information from ESET NOD32 Antivirus, version of virus signature database 3956 (20090323) __________

    The message was checked by ESET NOD32 Antivirus.
    Richard Urban, Mar 24, 2009
  8. Thanks to all for your comments, but I'm still sure, that this is not a
    hardware failure.

    I spent some time to do some tests again.
    Here are the results.

    1. When turning on the laptop in a cold state, the CPU fan starts for 1 or 2
    seconds and then stops again.
    2. Then the system (Windows Vista) boots (still no CPU fan, even the CPU
    gets much warmer).
    3. Until I reboot the machine, the CPU fan does not run!
    3. As soon as I reboot the machine (while the BIOS-POST runs), the CPU fan
    starts. It does not matter, if I reboot the machine immediately when the
    logon screen is displayed, or after some work (which makes the CPU quite hot
    of course).
    4. Then the system boots again keeping the fan speed.

    So my problem is definitively located somewhere in Vista.
    There must be a driver or something else, that prevents the fan to start
    while Vista runs.
    If I turn on the laptop and enter the BIOS setup, the fan starts
    automatically after some time, like it should also be in Windows.

    So, my question again.
    Which driver or component could be responsible for manipulating the CPU fan

    Markus Eßmayr, Apr 1, 2009
  9. Again, contact the manufacturer while still under warranty. Laptop computers
    come with manufacturer supplied power/fan monitoring software/hardware. The
    manufacturer best knows how to troubleshoot these supplied services and

    When you know for certain that there are no manufacturer supplied utilities
    or hardware that may be causing the problem you can then start inquiring of

    Until then you are just chasing your tail.


    Richard Urban
    Microsoft MVP
    Windows Desktop Experience
    Richard Urban, Apr 1, 2009
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