Results 1 to 10 of 10

Thread: Limit Laptop CPU Frequency on AC

  1. #1
    Join Date
    Oct 2007
    Beans
    135

    Limit Laptop CPU Frequency on AC

    My laptop has a terrible overheating problem. Whenever it runs at 100% while on AC, it goes up to about 90 Celsius. If I unplug it, the maximum frequency it can reach is 800 MHz, with a temperature of about 55 C. I need a way to change the maximum AC frequency from 2,300 MHz to something around 1,500 MHz (or lower, depending on how hot that gets).

    Can someone tell me how to do this? I've searched around on the forums for a while, but haven't found a solution.

  2. #2
    Join Date
    Mar 2008
    Location
    Ontario, Canada
    Beans
    85
    Distro
    Ubuntu 10.10 Maverick Meerkat

    Re: Limit Laptop CPU Frequency on AC

    what is the output of:

    sudo cat /sys/devices/system/cpu/cpu0/cpufreq/scaling_available_frequencies

  3. #3
    Join Date
    Oct 2007
    Beans
    135

    Re: Limit Laptop CPU Frequency on AC

    Code:
    2300000 2200000 2000000 1800000 1600000 800000

  4. #4
    Join Date
    Mar 2008
    Location
    Ontario, Canada
    Beans
    85
    Distro
    Ubuntu 10.10 Maverick Meerkat

    Re: Limit Laptop CPU Frequency on AC

    hrm, now i dont know how to do this but... if temp is over lets say 75 then run:

    cpufreq-selector -f 1600000

    or what ever speed you want of the output... i just don't know where to add this

  5. #5
    Join Date
    Jul 2006
    Beans
    108
    Distro
    Ubuntu 11.04 Natty Narwhal

    Re: Limit Laptop CPU Frequency on AC

    u could use emifreq-applet.
    Goto system -> administration -> synaptic package manager
    there click on find and type cpu
    scroll down and u will find emifreq-applet..
    install it..
    restart.
    once u are in ubuntu, right click on one of ur panels and click on add to panel. There should be a new cpu related applet. There you can manually set the clock speed or choose automatic. You can also view ur cpu temp with this applet.

    p.s. the speed needs to be set everytime u start ubuntu. It would be at automatic otherwise.

  6. #6
    Join Date
    Oct 2007
    Beans
    135

    Re: Limit Laptop CPU Frequency on AC

    Thanks, that will work as a temporary solution. But is there a way to globally restrict the maximum frequency?

  7. #7
    Join Date
    Mar 2008
    Location
    Ontario, Canada
    Beans
    85
    Distro
    Ubuntu 10.10 Maverick Meerkat

    Re: Limit Laptop CPU Frequency on AC

    Quote Originally Posted by nightwolf2k5 View Post
    u could use emifreq-applet.
    Goto system -> administration -> synaptic package manager
    there click on find and type cpu
    scroll down and u will find emifreq-applet..
    install it..
    restart.
    once u are in ubuntu, right click on one of ur panels and click on add to panel. There should be a new cpu related applet. There you can manually set the clock speed or choose automatic. You can also view ur cpu temp with this applet.

    p.s. the speed needs to be set everytime u start ubuntu. It would be at automatic otherwise.
    An applet is nice, but I think he wants it to run in the background and not care.

  8. #8
    Join Date
    Mar 2008
    Location
    Ontario, Canada
    Beans
    85
    Distro
    Ubuntu 10.10 Maverick Meerkat

    Re: Limit Laptop CPU Frequency on AC

    Depends on the laptop bios. but there is usually a setting where you can sellect the FBS (front side bus). eg. from 133mgz to 100mgz.

  9. #9
    Join Date
    Oct 2007
    Beans
    135

    Re: Limit Laptop CPU Frequency on AC

    My bios doesn't have any settings like that to configure. Also, messing with a bios setting isn't what I am looking for. I dual boot with Vista - which doesn't have an overheating problem. I use Vista to play games - crippling my processor for Vista isn't an ideal solution.

  10. #10
    Join Date
    Oct 2007
    Beans
    135

    Re: Limit Laptop CPU Frequency on AC

    I found two somewhat acceptable solutions: I used sudo dpkg-reconfigure gnome-applets to give the frequency applet root permissions (letting me change it on demand, like emifreq-applet, but without the graphical glitches). I also used gconf-editor to show the frequency settings in the applet. Choosing maximum power saver forces my processor to stay at 800 MHz. Ideally I want to limit it to 1600 MHz, but the 800 MHz solution is fine for what I use the computer for.

Bookmarks

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •