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kingmoffa
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Joined: 08 Dec 2003
Posts: 22
Location: Lowestoft , England.

PostPosted: Tue Feb 10, 2004 12:57 pm    Post subject: iBook Fan Reply with quote

Hello all,

I am wondering about support for the fan / cooler in my iBook 900 G3.

/proc/cpuinfo reports an uncalibrated cpu temp of 35 C. Is this expected??? I have no idea where the temp sensor in the iBook is and even if it reliable.

Looking around G4 iBooks can load the module therm_adt7467 , looking lika a G4 only solution. Does a similar thing exists for the G3?

Can anyone please enlighten me?
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ozonator
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Joined: 11 Jun 2003
Posts: 591
Location: Ontario, Canada

PostPosted: Tue Feb 10, 2004 2:23 pm    Post subject: Reply with quote

As far as I know, the temperature sensor in the G3 used in your iBook (PPC 750 FX) is not reliable, at least in that the reading shown in /proc/cpuinfo likely isn't an accurate reading of the CPU temperature. I have just about the same iBook as you (2.2, 800 MHz, same revision of the G3), and remember looking into this when I got it last May.

Regarding the fan, my experience is that it will cut in and out as needed, with no software/kernel support required. During a long compile when sitting on a surface that doesn't dissipate heat well, the fan will cut in; it cuts out after the compile is done and the CPU is idle for a little while. In other words, this seems to be handled adequately by the iBook's BIOS.

I might as well add that the best thing I've found for reducing both CPU temperature and power consumption is something to manage the CPU frequency scaling. Make sure your kernel has frequency scaling support, then emerge and use cpudyn -- it's simple to configure (simpler than cpufreqd; the default cpudyn config is likely fine), and it works brilliantly on my iBook, reducing my CPU speed when it's idle and increasing it again when busy.
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kingmoffa
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Joined: 08 Dec 2003
Posts: 22
Location: Lowestoft , England.

PostPosted: Tue Feb 10, 2004 2:46 pm    Post subject: Reply with quote

thanks for the prompt reply.

If the fan is controlled by the bios then thats good, saves me some grief and paranoia.
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KruzeS
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Joined: 10 Jul 2003
Posts: 60
Location: Portugal

PostPosted: Tue Feb 10, 2004 11:16 pm    Post subject: Reply with quote

ozonator wrote:
Regarding the fan, my experience is that it will cut in and out as needed, with no software/kernel support required. During a long compile when sitting on a surface that doesn't dissipate heat well, the fan will cut in; it cuts out after the compile is done and the CPU is idle for a little while. In other words, this seems to be handled adequately by the iBook's BIOS.


I have the same iBook, and I don't think it's the CPU fan that cut's in. I've come to belive it's the hard disk that heats up, and consumes the most power. The noise seams to come from the place where you can (barely) hear the disk. CPU intensive jobs that don't handle a lot of data do not seam to get the fan going. Just try an "void main(){while(1);}" for a (long) while...

That being said, sitting on a cold surface does help... A LOT!
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ozonator
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Joined: 11 Jun 2003
Posts: 591
Location: Ontario, Canada

PostPosted: Wed Feb 11, 2004 12:13 am    Post subject: Reply with quote

KruzeS wrote:
I have the same iBook, and I don't think it's the CPU fan that cut's in. I've come to belive it's the hard disk that heats up, and consumes the most power. The noise seams to come from the place where you can (barely) hear the disk. CPU intensive jobs that don't handle a lot of data do not seam to get the fan going. Just try an "void main(){while(1);}" for a (long) while...

That being said, sitting on a cold surface does help... A LOT!


Interesting; you could be right about it being a fan more for the disk -- the long compiles that cause the fan to start do tend to involve both a lot of CPU and a lot of disk. On the other hand, would a 4200 RPM drive really get that hot, even in a confined space?

Now that I think about it, since there are only two apparent grilles for air to get in or out, I'd bet the fan is likely placed in such a way that moves air through the machine a bit more than convection would. So, my hunch is that the fan helps move air from what I assume is the intake (at the display hinge) through the machine and out the front left side (the other little grille). And, I suspect the fan isn't big -- I've never felt anything approaching a breeze near either grille.

This is all just a guess, though, since I've never had the thing apart other than to install memory and a wireless card under the keyboard. Anyone have one of these apart and see the fan?

A related aside: after I replaced the heat sink and fan on the Duron 1200 in my desktop at home, I found myself waiting for a compile to finish on my iBook when I noticed the now unsed heat sink, cleaned and fan removed. To make a long story short, I'm now getting into the habit of putting the heat sink on the front left of the iBook (where my left wrist would rest, the part of the top that gets hottest) during long compiles. After confirming that there is some heat transfer (the heat sink warms up quite a bit after a while, keeping the plastic underneath cooler than it otherwise would be), my highly unscientific conclusion is that the iBook fan does indeed seem to cut in much less often when I've got that big AMD heat sink sitting there. Hard to type with it there, though. :)
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garn
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Joined: 10 Sep 2003
Posts: 131

PostPosted: Wed Feb 11, 2004 6:19 pm    Post subject: Reply with quote

The fan is a 1" on the 500MHz but I think the newer models have bigger ones (Never set both fans next to each other and don't feel like taking apart my book to see)
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Massimo B.
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Joined: 09 Feb 2005
Posts: 1564
Location: Germany

PostPosted: Fri Jun 24, 2005 7:49 pm    Post subject: Reply with quote

Does anyone know, where I can get a spare part for this fan of my iBook G3-600? It's making an unusual sound like clattering. Next time I open the book I want to try to replace it.
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