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MichaelLong
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Joined: 02 Aug 2007
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PostPosted: Wed Aug 15, 2007 12:14 pm    Post subject: Temperature issues on G5 Reply with quote

Hi,

Using Gentoo for a couple of month now on x86 and x86_64 I was tempted to install Gentoo on my G5 Dual 2 GHz PowerMac too.

Unfortunately I was not successfull until now. The trouble starts, when I try to extract the stage3 tar file. Near at the end of the extracting process fans are going noisy. I can barely read something like "temperature critial shutdown" or something like that and the computer is off. After a few attemps and re-extractions I came to the point of compiling a new kernel and here the same happens:

Within three seconds after pressing make -j2 (and looking at /sys/devices/temperature/...) the temperature of core 1 or core 2 is rising from 45°C to 63°C instantly and then shutting off.

So that means even little short load can shutdown my G5 in linux. In MacOS X I did a stress test to reproduce this behaviour but with no success. The max temperature of both cores were about 55°C. The casing is absolute clean, all tests are done at an ambient temperature of about 22°C.

For my knowledge concerning the PowerPC-plattform I run out of options. Hope you have some ideas!

Greets

MichaelLong
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lordcris
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PostPosted: Fri Aug 17, 2007 2:05 pm    Post subject: Reply with quote

what are the values of sensorN_limit in /sys/devices/temperatures/
you should try and set them to a lower value ( ex. echo 43 > sensor1_limit )
mine are set to 43
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corsair
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PostPosted: Fri Aug 17, 2007 2:12 pm    Post subject: Reply with quote

You should open a bugreport at http://bugzilla.kernel.org regarding this problem and add benh AT kernel.crashing.org to the CC list. That's the person who might be able to help you.

regards,

-corsair
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MichaelLong
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PostPosted: Sat Aug 18, 2007 3:25 pm    Post subject: Reply with quote

lordcris, there is no sensor1_limit nor other sensor files in /sys/devices/temperatures

Greets
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lordcris
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PostPosted: Sat Aug 18, 2007 3:42 pm    Post subject: Reply with quote

MichaelLong wrote:
lordcris, there is no sensor1_limit nor other sensor files in /sys/devices/temperatures

Greets


hi,
you should try and load the module which controls temperatures and fan speeds.
for your system it is called "windfarm"
bye
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MichaelLong
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PostPosted: Mon Aug 20, 2007 8:16 am    Post subject: Reply with quote

Thanks for the help so far!

At the moment I'm testing the system with the install-ppc64-minimal-2007.0-r1 CD, the used kernel is a 2.6.19-gentoo-G5. Unfortunately this kernel does not supply a windfarm module :cry:

I'll try to setup a custom kernel with this module enabled, if this won't work either, I'll have to file a bug at kernel.org as corsair recommends.


Thanks, bye
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corsair
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PostPosted: Thu Aug 23, 2007 12:27 pm    Post subject: Reply with quote

nah.. windfarm is for PowerMac G4. I've heard about your problems before. Please get in contact with benh. He's the one, who has written the termal driver for the G5s.
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