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Thread: Power management Under Fedora

  1. #1
    Join Date
    Mar 2010
    Posts
    184

    Power management Under Fedora

    Hello,
    I installed a fresh Fedora 10. Unfortunately (compared to my previous F7 installation on the same NB), the CPU frequency is not in the 800 MHz turned down on.
    Here is what I do
    Code:
    # Cat / sys/devices/system/cpu/cpu0/cpufreq/
    Can I manually add the Power safe governor? My CPU supports, according to
    Here is the code
    Code:
    Cat / sys/devices/system/cpu/cpu0/cpufreq/scaling_available_frequencies
    Still, I have the problem with it. So, if you have any solution for this then please let me know. Thanks in advance.
    www.techarena.in

  2. #2
    Join Date
    Nov 2009
    Posts
    347

    Re: Power management Under Fedora

    Hello,
    You should check the file
    Code:
    / etc / sysconfig cpuspeed intervene /.
    There you should find the line
    Code:
    GOVERNOR =
    Normally the value is empty, this means that by default the governor on demand is loading. But here you can enter the appropriate Governor. In your case this would look like this
    You have to modify it in this way
    Code:
    GOVERNOR = powersave

  3. #3
    Join Date
    Apr 2008
    Posts
    264

    Re: Power management Under Fedora

    Hello,
    Thanks for the reply, even i am facing the same problem. That would mean that I always Powersafe Mode, or on the road would always would have to change manually. Apart from the fact, I can not imagine that this works, because the "Powersafe" Governor loud "scaling_available_governors not exist? Any more guidance regarding this topic will be appreciated. Thank you for your help .

  4. #4
    Join Date
    Nov 2009
    Posts
    330

    Re: Power management Under Fedora

    Hello,
    I am indeed just in front of a CentOS, but the same phenomenon here. You can do the following times. Load the module manually by using the command
    Here is the code
    Code:
    modprobe cpufreq_powersave
    then you can use
    Code:
    cat / sys/devices/system/cpu/cpu0/cpufreq/scaling_available_governors
    check whether the Governor is available. You must then reboot one time to see whether the module also is loaded from the system permanently then.

  5. #5
    Join Date
    Mar 2010
    Posts
    184

    Re: Power management Under Fedora

    Hello,
    I tried your tip and it worked
    The line
    Code:
    - scaling_available_governors
    This line contained Powersafe. However, the module was gone after a restart. How can I convince the kernel, the module to load at startup? That is it should work every time I start my computer. Thank you.
    www.techarena.in

  6. #6
    Join Date
    Nov 2009
    Posts
    333

    Re: Power management Under Fedora

    Hello,
    Open views to the file / etc / init.d / cpuspeed. At about line 140 rum, it should be a section that looks about.
    Code:
    # Figure out default governor to use 
    case "$ drv" in 
    centrino | powernow-k8 | p4-clockmod | acpi-cpufreq | powersaver) 
    default_governor = ondemand 
    default_governor = user space 
    ;;
    Instead of on demand times you can here powersave about. The file is editable, but only as root.

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