removing PMU system file makes PB & iBooks run cooler?

Discussion in 'General Mac Discussion' started by cb911, Oct 31, 2003.

  1. macrumors 601

    cb911

    Joined:
    Mar 12, 2002
    Location:
    BrisVegas, Australia
    #1
    i was just reading Tech Tails #189 and saw this...


    seems safe... and people over at the Apple boards say that it works, but i'm not too sure about this?

    what do people here think? to me it seems very unsafe to be messing with system files like that...
     
  2. macrumors 6502a

    manitoubalck

    Joined:
    Jul 17, 2003
    Location:
    Adelaide, Australia
    #2
    Re: removing PMU system file makes PB & iBooks run cooler?

    Well it'll more thatn likley void the warrenty if mac find out that you're having processor troubles and that you've removed the file, but life no fun unless you take the odd risk,
     
  3. thread starter macrumors 601

    cb911

    Joined:
    Mar 12, 2002
    Location:
    BrisVegas, Australia
    #3
    are you serious it would void the warranty?! :eek: i never even thought about that...

    i guess i'll just leave this alone. i'm happy with my PB just the way it is.
     
  4. macrumors 601

    stoid

    Joined:
    Feb 17, 2002
    Location:
    So long, and thanks for all the fish!
    #4
    Since my friend has fried two video cards in his nearly 2 inch thick laptop I think I'm going to leave the system just the way it is.
     
  5. macrumors 6502a

    Vector

    Joined:
    Feb 13, 2002
    #5
    Re: Re: removing PMU system file makes PB & iBooks run cooler?

    This is not something that can void your warranty; it is simply a software hack. All this does is reset the power management settings that the computer uses. You are simply deleting the original PMU settings and then reseting them using the command and a restart. This creates a new PMU profile to replace the one that you deleted.

    If you are worried about messing something up (unlikely if you follow the directions) you can create a backup of the original settings, as the instructions say, and put them back if the new settings don't seem to work.

    This will not void your warranty. It is only a software change that can be reversed by replacing the recreated PMU settings file with the original or by reinstalling the os.
     
  6. macrumors 604

    iJon

    Joined:
    Feb 7, 2002
    #6
    it will not void your warranty like vector said. it is just software. since it is a preference file you will just be making a brand new set, your not deletling it completly.

    iJon
     
  7. thread starter macrumors 601

    cb911

    Joined:
    Mar 12, 2002
    Location:
    BrisVegas, Australia
    #7
    i was thinking it would be a bit strange if the warranty was void by changing a bit of software...

    i'm thinking about doing this on my PowerBook. i came across this KnowledgeBase article that talks about resetting the PMU, the actual hardware circuti though.

    the steps are alot shorter. this is for the new PB's :

    1. If the computer is on, turn it off.
    2. Reset the power manager by simultaneously pressing and then releasing Shift-Control-Option-power on the keyboard. Do not press the fn (Function) key while using this combination of keystrokes.
    3. Wait 5 seconds.
    4. Press the power button to restart the computer.

    if removing the PMU preference file only creates a new one (basically the same as resetting the pref file), what's the difference between resetting the hardware and removing the PMU pref file?

    aren't these two methods describing how to accomplish the same thing? or have i missed something?
     
  8. macrumors 6502

    Joined:
    Jun 22, 2003
    Location:
    Baltimore
    #8
    That article makes resetting the PMU seem like a last resort bug fix to be avoided. I don't really care how hot my PB gets, but if it is running cooler, would it be correct to assume that the rather noisy fan wouldn't run as frequently?
     
  9. macrumors 6502a

    Vector

    Joined:
    Feb 13, 2002
    #9
    It really isn't that big of a deal. as cb911 mentioned you can just perform a standard PMU reset which should yield the same or nearly the same results as the process previously described.
     

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