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Thread: Dell XPS 17 (l702x) fan usage

  1. #1
    Join Date
    May 2007
    Beans
    3

    Dell XPS 17 (l702x) fan usage

    Fan usage on ubuntu seems a lot higher than on windows seven, some missing driver maybe? i7 2nd generation not fully supported yet? someone has the same problem?

  2. #2
    Join Date
    Jun 2008
    Beans
    4

    Re: Dell XPS 17 (l702x) fan usage

    Hi All,

    I've noticed the same thing with my L701X and i7 core. I'm running Maverik and the fan seems to be spinning constantly. gkrellm places GPU C at around 53 °C for CPU loads below a few percent per thread. Anybody has any ideas if this behaviour is normal?

    (Positive effect: I can now use my laptop as an air filtration system.)

    Thanks for ideas and help

  3. #3
    Join Date
    Jun 2008
    Beans
    10

    Re: Dell XPS 17 (l702x) fan usage

    I have the same issue on my L701X. Please, any ideas to solve this? Running Natty 64-bit with latest kernel 2.6.39.

  4. #4
    Join Date
    May 2011
    Beans
    4

    Re: Dell XPS 17 (l702x) fan usage

    My experience will dells and fans has been the following:
    I own an inspiron 1520.
    I run ubuntu 10.04 on it (dropped 11.04 like a brick...)

    What happened for my was the opposite...the fan didn't run (not entirely true, the BIOS would eventually turn it on an uncomfortable temperature.

    Here's a post I just made:
    http://ubuntuforums.org/showthread.php?t=1722080

    Which contains the following:

    Assuming you can run i8kutils, this may be helpful:
    Here's a script I wrote, and instructions for adding it to auto start up (all users):
    Right...I have an inspiron 1520 and had fan issues.
    I fixed them using i8kutils, which is derived from the source code of i8k for windows, which was reverse engineered from Dell code.

    Note that i8k will let you run a fan on a dell at 0 (off), 1 (slow), or 2 (fast), and that there is a left and a right fan setting. Right and left don't seem to have anything to do with physical location- my machine has a fan on the left and thinks it's the right fan.

    i8kfan - 0 sets the right fan to 0 (off), left unchanged
    i8kfan - 1 sets the right fan to 1 (slow), left unchanged
    i8kfan - 2 sets the right fan to 2 (fast), left unchanged

    i8kfan 2 - sets the left fan to 2 (fast), right unchanged.

    i8kfan 2 2 sets both to fast

    Here are my instructions

    Install the i8k utility:
    sudo apt-get install i8kutils

    Create a fan script (I called it fan.sh), you will need to know the path to it:
    #!/bin/sh
    #Author jd.jayded
    #note: the temperatures set here may be overly conservative. Set as you wish.
    fan1=25 #turn fan on to 1
    fan2=45 #turn fan on to 2
    fanBack1=35 #turn fan back to 1
    minFan2=30 #minium time for fan to be spinning on mode two (seconds)
    minFan1=0 #minimum time for fan to be spinning on mode one (seconds), set to zero because it can be necessary to increase speeds

    while true ; do
    i=`i8kctl temp | tr -dc '[0-9]'` #i8kctl temp gives you current temperature, piped to trim to one numbers
    if [ $i -ge $fan1 ] ; #if it's greater than or equal to fan1
    then
    if [ $i -ge $fan2 ] ;
    then
    i8kfan 2 2
    sleep $minFan2
    else
    if [ $i -ge $fanBack1 ] ;
    then
    sleep $minFan2
    else
    i8kfan 1 1
    sleep $minFan1
    fi
    fi
    else
    i8kfan 0 0
    fi
    sleep 1s #run every second, not counting sleep used as a minimum amount of time to have a fan on
    done


    Create a start up script. I called it startup.sh
    #!/bin/sh
    modprobe i8k
    /path/to/fan.sh #location of the fan script


    Now execute these commands:
    sudo ln -s -T /path/to/startup.sh /etc/init.d/startup.sh
    sudo update-rc.d [startup script name] defaults

    The first command gives you a symbolic link to your startup script in the /etc/init.d directory
    The second command adds the startup script to the default runlevels. It's automatically run when you turn on the computer. That will give you warnings because I didn't bother learning the proper format for a System-V init script. man update-rc.d for more about init scripts.

    EDIT: sorry about the tabbing dying. I'm new to these forums.

  5. #5
    Join Date
    Jun 2008
    Beans
    10

    Re: Dell XPS 17 (l702x) fan usage

    Is this working for the Dell L70xxx series? There is no confirmation in this thread.

  6. #6
    Join Date
    Sep 2011
    Beans
    5

    Re: Dell XPS 17 (l702x) fan usage

    Having this issue myself, machine is running unbelievably hot. Fan is constantly running. It feels like it is actually making my room hotter than it already is...

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