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Reduce fan noise on PowerBooks - Removing Applefan extension
Authored by: fusiller on Aug 05, '06 08:12:02AM
Thanks to your hint Junkiesxl I finally managed to get my Powerbook G4 550 Mhz (yes quite an old one) back its previous silent behaviour. I also noticed incredible noise but it took me some time to realise that it all started just after installing 10.4. I first hoovered all dust out of the machine (always a good idea anyway to remove all dust periodically), then I thought it was just getting noisier with age... Thanks to some reading including yours I realised that some software control was involved.
To thank you for that and share a little more experience here is more :
with a little bit more of research I found the source code of the Applefan project on this link
which gave me more info on the extensions involved, namely :
AppleADM103x.kext, AppleADT746x.kext, AppleCPUThermo.kext, IOI2CADT746x.kext and AppleFan.kext.
Then I explored my original OS X system disk (version 10.0), the one that came with the machine, and explored it with great utility Pacifist (excellent software). I realised that there was no such extensions at the time at all. The machine at the time was probably just relying on the harware fan trigger. And it worked fine (proof is it is still working).
So, I decided to remove (actually copy in a safe place) all extensions involved in the AppleFan : the system is operating normally and the fan doesn't go crazy any more.
Warning : please note that I own an old 550 MHz, for which overheating is probably not a big risk. You guys with higher clock frequencies must be carefull !
Regards to all

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