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Thread: Laptop fan blowing is much hotter in Ubuntu.

  1. #1
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    Laptop fan blowing is much hotter in Ubuntu.

    The air coming out of my laptops cooling grill seems to be much hotter when I use linux compared to when I use windows. I have no way of proving this because I don't have a CPU temperature monitoring utility in windows. In linux, the monitor says it's at 69 degrees C.
    The air coming out feels much hotter when I keep my hand in front the the vents. Is that normal? My CPU is a Celeron M running at 1.5 GHz. I use windows XP and Ubuntu 9.10.

  2. #2
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    Dec 2009
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    Ubuntu 9.10 Karmic Koala

    Re: Laptop fan blowing is much hotter in Ubuntu.

    ow...izit?

    but mine is totally diff from u..

    when i'm using win vista...the fan is so damn hot!!

    then i change to win 7...its much better...

    and i juz change to Ubuntu last sunday...the 1st time using LINUX...xD

    much more better!!!

    love it...love Ubuntu...haha

  3. #3
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    havelock, nc
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    Ubuntu Karmic Koala (testing)

    Re: Laptop fan blowing is much hotter in Ubuntu.

    Chances are linux isn't scaling the processor frequency down, that and Ubuntu idle processor usage on a non optimized install is at least 2-3 times higher than the same fresh install of WinXP.

  4. #4
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    Re: Laptop fan blowing is much hotter in Ubuntu.

    Is that bad? What would it do to battery life?

  5. #5
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    Re: Laptop fan blowing is much hotter in Ubuntu.

    "In linux, the monitor says it's at 69 degrees C"

    That sounds like the sensor is not configured properly, unless you have a thermocouple or a thermometer to measure it I don't believe it is that high.

    Battery life is the ultimately the measuring rod to be used, how does it compare?

  6. #6
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    Re: Laptop fan blowing is much hotter in Ubuntu.

    I should have a thermometer lying around somewhere. I'll post back. Meanwhile, is the lm-sensors library / program installed by default in ubuntu? I posted another thread about this, but since it's probably relevant here, I posted the question again.

  7. #7
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    Re: Laptop fan blowing is much hotter in Ubuntu.

    Yes.. you were right. The temperature of the air comming out of the vents was 41 degrees C. But I still feel it's a bit on the hot side. Is there a way to check if the hard drive is continuously running? When I press my ear to the laptop, I hear a small humming noise. I don't know if this is the fan or the hardrive (I feel stupid saying that. )

  8. #8
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    Re: Laptop fan blowing is much hotter in Ubuntu.

    Type the top command and see what/how much is the highest.

    In my case, whenever the air blowing from the vents heated up, I would see ntop running at almost 100 % CPU (in the output of top). When I kill the process for ntop, the CPU %age utilisation plummets and air blowing out is cooler.
    Debugging tip:
    When you have eliminated all which is impossible, then whatever remains, however improbable, must be the truth.
    --- Sherlock Holmes.

  9. #9
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    Re: Laptop fan blowing is much hotter in Ubuntu.

    What is ntop?

  10. #10
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    Re: Laptop fan blowing is much hotter in Ubuntu.

    The programme powertop worked very well for me in making my computer running cooler and lengthening battery life. Without it, battery life was much less than under Vista. With it, a little longer.

    http://www.lesswatts.org/projects/powertop/

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