My macbook works well while connected to the charger, but using the battery it gets really slow
My macbook pro 2011 yosemite 10.10.1, (2,3 GHz Intel Core i5 / 4 GB 1333 MHz DDR3 / Intel HD Graphics 3000 384 MB) recently started to present a problem that when using only the battery, it gets really slow, but connected to the charger, it operates normally. I have already taken to a technical assistance but was not presented any problem in the battery. And when I open activity monitor it shows that the kernel_task process uses almost 100% CPU and so is almost 0% idle, so it is almost impossible to use the computer (using the battery). Is there anything I can do to prevent this process using 100% CPU?
My recommendation for a SMC reset was initiated by your posts indication poor performance when under battery power. Often a SMC reset will correct bad battery behavior but apparently not in your case.
Look at this article and see if there are any possible hints for correction of the problem:
http://www.cnet.com/news/kerneltask-process-taking-up-an-inordinate-amount-of-cp u/
If not, the the best option will be an Apple store genius bar appointment.
Ciao.
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http://support.apple.com/kb/HT3964
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If you are having an issue with your iPod touch not being recognized by iTunes when connected to your Windows computer, I would suggest that you troubleshoot using the steps in this article -
iPhone, iPad, or iPod not recognized in iTunes for Windows - Apple Support
Thanks for using Apple Support Communities.
Sincerely,
Brett L -
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An iPhone will not pair via Bluetooth to a computer (Mac or Windows) except for personal hotspot and then only if your cellular plan supports it. https://discussions.apple.com/docs/DOC-7722
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