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No fan throttling on G5?
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tparker
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Joined: 03 Oct 2002
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PostPosted: Wed Aug 25, 2004 12:58 am    Post subject: No fan throttling on G5? Reply with quote

I'm currently in the process of installing Gentoo on my G5 powermac (downloading stage3 as I speak). One thing I do notice however is that the fans in the machine are spinning VERY quickly - and it's quite loud. All this over nothing too, as the CPU utilisation isn't even very high. It of course also worries me that the fans are going so quick I don't know how long they will last!

I assume that what is missing is that my current environment (ppc64 2001.1 LiveCD) does now know how to throttle down the fan?

Is there something I need to do to get the fans to slow down once I boot into my proper linux environment? Or do I just have to live with the machine sounding like it's about to take off?

Terence
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bad111
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PostPosted: Wed Aug 25, 2004 1:16 am    Post subject: Reply with quote

I know exactly what they sound like man, jet engines ... :D .... and as far as I know, there isn't anything to deal with this problem. I could be wrong, and I hope I am.
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bruda
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PostPosted: Wed Aug 25, 2004 1:30 am    Post subject: Reply with quote

Hi.

Set CONFIG_THERM_PM72 (Device Drivers -> Macintosh device drivers -> Support for thermal management on PowerMac G5) and recompile your kernel. Works very well for me (kernel 2.6.7-r0).

As far as I know there is no immediate danger if the fans are running full speed (essentially, the hardware notices that nobody is controlling the fans and kick them full speed), but it cannot do any good to the fans themselves in the long run.
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bad111
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PostPosted: Wed Aug 25, 2004 2:38 am    Post subject: Reply with quote

Thats beautiful.... 8O
Now, howabout that sound issue, eh hehehe :cry:
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bruda
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PostPosted: Wed Aug 25, 2004 12:42 pm    Post subject: Reply with quote

That's a very good question... :D
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bad111
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PostPosted: Thu Sep 02, 2004 1:22 am    Post subject: Reply with quote

I set that, and compiled the kernel... but my fans still go full speed.... am i missing any other steps?
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bad111
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PostPosted: Thu Sep 02, 2004 1:53 am    Post subject: Reply with quote

maybe i'll try it in a 64 bit install... i think thats what you use it on. I tried it on a 32/32 install....
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bruda
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PostPosted: Thu Sep 02, 2004 3:00 pm    Post subject: Reply with quote

bad111 wrote:
maybe i'll try it in a 64 bit install... i think thats what you use it on. I tried it on a 32/32 install....

Yes, I have a 64 bit system, but that should not in theory make any difference (YDL had a 32 bit kernel with fan control alright, though I did not compile any myself). What is your kernel version? I can confirm from my experience that 2.6.7-r0 and 2.6.8-r3 do work as far as fan control is concerned.
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bad111
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PostPosted: Thu Sep 02, 2004 3:16 pm    Post subject: Reply with quote

kernel 2.6.7-r14 ... i'll try some other kernels. Thanks for the help so far.
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