Carlaclimb

Q: Why my macbook pro run very slow when unplug the energy cable?

I'm trying to find out why my mac pro starts to freeze and slow dow after I unplug the energy cable.

 

If Some one have any idea please help me!

 

What can I do to fix this?

 

Is under warranty? Is a factory problem? He do not recognize the battery properly?

 

 

 

Thank you.

MacBook Pro, Mac OS X (10.7.5)

Posted on Aug 5, 2013 9:54 AM

Close

Q: Why my macbook pro run very slow when unplug the energy cable?

  • All replies
  • Helpful answers

  • by Allan Eckert,

    Allan Eckert Allan Eckert Aug 5, 2013 9:59 AM in response to Carlaclimb
    Level 9 (54,040 points)
    Desktops
    Aug 5, 2013 9:59 AM in response to Carlaclimb

    The MBP senses it is running on the battery and throdles itself down to extend battery life

     

     

    Allan

  • by Carlaclimb,

    Carlaclimb Carlaclimb Aug 5, 2013 10:07 AM in response to Allan Eckert
    Level 1 (0 points)
    Aug 5, 2013 10:07 AM in response to Allan Eckert

    Thanks for your quick answer but can you explain a little bit better for a simple human, sorry but I do not understand alot of computers.

  • by Allan Eckert,

    Allan Eckert Allan Eckert Aug 5, 2013 10:12 AM in response to Carlaclimb
    Level 9 (54,040 points)
    Desktops
    Aug 5, 2013 10:12 AM in response to Carlaclimb

    When plugged into the line for power your MBP is able to run at full potenial.

     

    In an effort to extend battery life when not plugged into the line for power, the MBP reduces it need for power by reducing the clock speed for the CPU.

     

    So whenever possible, plug the MBP into the power outlet for maximum performance.

     

    Allan

  • by Carlaclimb,

    Carlaclimb Carlaclimb Aug 5, 2013 10:21 AM in response to Allan Eckert
    Level 1 (0 points)
    Aug 5, 2013 10:21 AM in response to Allan Eckert

    great, now I have to walk around with it connected to the power cord?
    I understood his point of view, but what can I do to stop this problem?
    When I bought did not have this problem.
    What do I do to fix it?
    How do i keep the same CPU speed all the time?
    thanks

  • by Allan Eckert,

    Allan Eckert Allan Eckert Aug 5, 2013 10:32 AM in response to Carlaclimb
    Level 9 (54,040 points)
    Desktops
    Aug 5, 2013 10:32 AM in response to Carlaclimb

    You can't. There is no way to do that.

     

    How old is your Mac?

     

    The battery may be starting to wear out if the difference is now getting to be that noticable. On my MBP, the difference is hardly noticable.

     

    Take it to Apple and ask them to check out the battery.

     

    Allan

  • by Carlaclimb,

    Carlaclimb Carlaclimb Aug 5, 2013 11:14 AM in response to Allan Eckert
    Level 1 (0 points)
    Aug 5, 2013 11:14 AM in response to Allan Eckert
    My mac is from 2010 and the battery is very durable, keeps a 5 or 6 hours easily.
    I'm in Brazil and here just to diagnose the problem they charge about U.S. $ 50.00.
    I'm trying to diagnose the problem, I read something about a "kernel_task" like using 300% CPU.
    Thank you for your attention.

     

     

    http://www.rdoxenham.com/?p=259

  • by Carlaclimb,Solvedanswer

    Carlaclimb Carlaclimb Aug 5, 2013 6:29 PM in response to Allan Eckert
    Level 1 (0 points)
    Aug 5, 2013 6:29 PM in response to Allan Eckert

    Hey! I fond the solution!!!!

    and works, here is the steps..

    1) Open System Information (under Apple icon in upper-left, click About This Mac, click More Info)

    2) Click System Report button, under Hardware, find your "Model Identifier" -remember this for later use

    3) Navigate to /System/Library/Extensions an right-click, Show Package Contents of IOPlatformPluginFamily.kext

    4) Open Contents/PlugIns and Show Package Contents of ACPI_SMC_PlatformPlugin.kext

    5) Open Contents/Resources

    6) Find your MacBookAir?_?.plist (? = your model identifier from step 2) and delete the file

    7) Reboot! Remember, anytime you do a System Update, you may need to repeat this process

     

    I got from this site: http://tech.superhappykittymeow.com/?p=258

    SOLVED: Macbook Air kernel_task slowness | tech.superhappykittymeow.com

     

    Thanks for your help!

  • by chillout15,

    chillout15 chillout15 Jun 24, 2014 9:20 PM in response to Carlaclimb
    Level 1 (0 points)
    Jun 24, 2014 9:20 PM in response to Carlaclimb

    Had the same problem too. This made my MBP back to normal. It doesn't slow down when unplugged anymore.

  • by tungsgvnus,

    tungsgvnus tungsgvnus Oct 3, 2015 11:22 PM in response to Carlaclimb
    Level 1 (0 points)
    Oct 3, 2015 11:22 PM in response to Carlaclimb

    Update!

    I used to do this method whenever i reinstall OS X. This week i upgraded to new OS X the El Capitan and this method is not working anymore. The reason is MAC OS don't let you delete  your MacModel.plist (the model of your Mac) . (You don't have permission to delete in new OS X El Capitan). So you have to go back with Yosemite. However,  there are 1 way to go around if you have 1 extra Mac machine and 1 external HDD.  Take the HDD (or SSD) from slow machine out , plug in to external HDD enclosures and connect with other MAC OS to delete MacModel.plist file in HDD.

    For example: my Mac Pro  2011 using SSD 2.5', I took the SSD out, plug it with external HDD enclosure and connect it with my sister's iMac to delete MacBook8_1.plist.

    Hope it will help.