kernel_task causing issues yet again!

Discussion in 'MacBook Pro' started by ethan-1878, May 4, 2015.

  1. ethan-1878 macrumors member

    Joined:
    Jun 8, 2014
    #1
    Hi all,

    *IN A NUTSHELL*
    • 2012 non retina MBP is experiencing kernel panics
    • kernel_task using up 300%+ CPU
    • have tried multiple 'fixes' (see below)

    I've always experienced issues with kernel_task on my MBP (mid-2012 9,2) since I upgraded the RAM and Optibayed it. Since then I have took it to an Apple store and had a Genius take a look at it - everything came back as fine and working properly.

    As some of you will know, the kernel_task issue sucks up 300-400% CPU and causes the fans to run at full speed 24/7. Not only does this result in a painfully slow/unusable Mac, it actually makes a pretty horrific noise. This time around, it's happened at the worst possible time. I'm a DJ and have a gig this saturday so no MBP means no gig with in turn means no money to get MBP fixed.

    Here's what I've tried so far:
    • Reset PRAM
    • Reset SMC
    • Done a clean install of Mountain Lion (through Internet Recovery, I was running the latest public release of Yosemite - 10.10.3)
    • Ran a terminal command which moves the SMC kext out of a kext bundle into my home folder

    All of the above have work for me in the past just not in any particular order.
    I haven't got any peripherals connected to my Mac.
    Since Resetting PRAM and SMC, my keyboard backlighting has stopped working and System Preferences doesn't have a backlighting section in the keyboard menu.

    Please don't give me the usual "Oh it's the upgrades that you did which are causing kernel panics" because since they have started happening, I have replaced all of the original hardware back into my mac (including the superdrive) and I still get kernel panics.

    Sorry for the rather wordy post but I thought details might be important in finally getting to the bottom of this really annoying issue.

    Thanks in advance for any help.
     
  2. chrfr macrumors 603

    Joined:
    Jul 11, 2009
    #2
    Do you have logs from the panics?
    Also, moving system extensions is a bad idea and may be responsible for some of the issues you're now seeing.
     
  3. ethan-1878 thread starter macrumors member

    Joined:
    Jun 8, 2014
    #3
    Not that i know of - where are they usually stored?

    I've moved the kext's multiple times in the past and it's fixed my problem without any nasty side effects although I am aware that I shouldn't really be moving system files about.
     
  4. ethan-1878 thread starter macrumors member

    Joined:
    Jun 8, 2014
    #4
    Not that i know of - where are they usually stored?

    I've moved the kext's multiple times in the past and it's fixed my problem without any nasty side effects although I am aware that I shouldn't really be moving system files about.
     
  5. ethan-1878 thread starter macrumors member

    Joined:
    Jun 8, 2014
    #5
    Had an appointment at the Genius Bar today. They confirmed that there is a fault with the Palm Rest temperature sensor - that explains the fans spinning up, one down, one to go - after further delving into the sensor reports, the Apple Genius also found that I have a faulty ambient light sensor - there's the explanation for my nonexistent keyboard backlighting.

    I've left my MBP at the Apple Store for repair and was advised it would take 3-5 days for them to complete the service. I'll be sure to check back when they call me and let you all know how successful their fix is.
     
  6. ethan-1878 thread starter macrumors member

    Joined:
    Jun 8, 2014
    #6
    Checking back in - the Genius Bar have had a representative liasing with me for the past 2 days. He explained that they originally thought that the issue was related to the trackpad (£70 repair) so they replaced that for me and there was no change. The next port of call was to replace the top cover (£120) this never worked either. This means that the last possible component that could cause such an issue is the logic board. So the Apple Genius has replaced my logic board (£380) and they're currently running the post-repair tests to confirm whether or not the logic board has definitively repaired the issue - it can't really be anything else.
     

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