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)
The MBP senses it is running on the battery and throdles itself down to extend battery life
Allan
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.
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
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
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
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!
Had the same problem too. This made my MBP back to normal. It doesn't slow down when unplugged anymore.
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.
Why my macbook pro run very slow when unplug the energy cable?
