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Control fan of G4 iBook

Message #1 - Posted 2006/12/30 - Roman Pearce

Does anyone know a way of manually controlling or configuring the fan of an iBook G4 ? Presumably this would work for the Powerbook as well. In my case I know there is a fan, and I know it works because my 10.3 install cd turns it on full blast whenever I boot from it. My problem is that I am frequently encoding large music files or doing long computations and the machine gets too hot. I use reduced CPU to keep it cool, but I would prefer to run the fan. Earlier versions of 10.3 seemed to turn the fan on at around 60 C (internal temp), but 10.3.9 doesn't seem to turn it on at all. I have let it get up to 75C, which is insane.

Does anybody know what I can do about this ? I have tried hacking the Info.plist in the AppleFan extension, however it had no effect (see this thread: http://forums.macrumors.com/showthread.php?t=238961 note: early posts contain errors, so be sure to read into the thread). One guy there even went as far as recompiling AppleFan.kext with modified values however he reports no difference (timmer on page 11, see also tokyovigilante on page 9 for the hypothesis about how the fans are controlled).

If someone knows of an app to configure or even just run the fans, I would be very grateful to hear of it. Otherwise, does anyone know for sure how the fans in iBooks and Powerbooks are actually controlled ? I would appreciate any help or expertise.

Thanks,
Roman

Message #2 - Posted 2006/12/30 - Florian Zschocke

"Roman Pearce" <rpearcea@gmail.com> schrieb:

Does anybody know what I can do about this ? I have tried hacking the Info.plist in the AppleFan extension, however it had no effect (see this thread: http://forums.macrumors.com/showthread.php?t=238961 note: early posts contain errors, so be sure to read into the thread). One guy there even went as far as recompiling AppleFan.kext with modified values however he reports no difference (timmer on page 11, see also tokyovigilante on page 9 for the hypothesis about how the fans are controlled).

Absolute useless, these fans are not controlled by software.

Florian

Message #3 - Posted 2006/12/30 - Roman Pearce

Florian Zschocke wrote:

"Roman Pearce" <rpearcea@gmail.com> schrieb:

Does anybody know what I can do about this ?

Absolute useless, these fans are not controlled by software.

I think they are, because Linux controls them. Also, the Apple hardware test cd will spin the fans to test them.

Message #4 - Posted 2006/12/30 - Florian Zschocke

"Roman Pearce" <rpearcea@gmail.com> schrieb:

Florian Zschocke wrote:

"Roman Pearce" <rpearcea@gmail.com> schrieb:

Does anybody know what I can do about this ?

Absolute useless, these fans are not controlled by software.

I think they are, because Linux controls them. Also, the Apple hardware test cd will spin the fans to test them.

Sorry, I had to be more concrete. Titanium fans are not controlled by software. IBooks G4 I'm not so sure but I guess no. If you find a readable sensor for temperature or fan speed, there is a good chance that it is controlled by software. Aluminum G4 has a readable sensor for temperature. Look at http://www.bresink.de/osx/TemperatureMonitor.html . If your I machine shows a temperature information other than from the SMART monitor of your disk, it may be controlled by the OS. Otherwise it is controlled by the firmware.

Florian

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