Fan management PowerMac7,2

Fan management PowerMac7,2

[Martin Kukač]

Hello,

I was directed to this list on #ppc64/freenode IRC channel. I have 
PowerMac7,2 (AGP, 2xPowerPC 970(2.2) 2GHz) and I wanted to try kernel 
supporting kvm-pr module, which is not in 3.2.63 kernel provided with 
Debian Wheezy. I downloaded 3.14.24, compiled it using original config 
from 3.2.63 and after booting fan management does not work. I tried 
therm_pm72 (which is deprecated, but works well with Debian kernel) and 
windfarm_pm72 modules, but neither worked - after about five minutes 
from boot all fans go to maximum and stay this way no matter the CPU 
load or frequency.

I downloaded vanilla 3.2.64, compiled it the same way and there fans 
work with therm_p72 well. This kernel does not have kvm-pr, so I 
reverted to original kernel provided with Wheezy.

I looked to logs, i tried to search the web whether anyone had already 
the same problem, but it seems that nobody else described not to say 
solved this. Can anyone please point me to anything that would help? I 
can provide whatever log files required.

Thanks,

Martin Kukac

Re: Fan management PowerMac7,2

[Michel Dänzer]

On 19.11.2014 21:04, Martin Kukač wrote:
> Hello,
>
> I was directed to this list on #ppc64/freenode IRC channel. I have
> PowerMac7,2 (AGP, 2xPowerPC 970(2.2) 2GHz) and I wanted to try kernel
> supporting kvm-pr module, which is not in 3.2.63 kernel provided with
> Debian Wheezy. I downloaded 3.14.24, compiled it using original config
> from 3.2.63 and after booting fan management does not work. I tried
> therm_pm72 (which is deprecated, but works well with Debian kernel) and
> windfarm_pm72 modules, but neither worked - after about five minutes
> from boot all fans go to maximum and stay this way no matter the CPU
> load or frequency.
>
> I downloaded vanilla 3.2.64, compiled it the same way and there fans
> work with therm_p72 well. This kernel does not have kvm-pr, so I
> reverted to original kernel provided with Wheezy.
>
> I looked to logs, i tried to search the web whether anyone had already
> the same problem, but it seems that nobody else described not to say
> solved this. Can anyone please point me to anything that would help? I
> can provide whatever log files required.

Might be the same problem as discussed in 
https://lists.ozlabs.org/pipermail/linuxppc-dev/2013-August/109700.html 
and the following posts: The i2c_powermac module doesn't get loaded 
automatically with recent kernels.


-- 
Earthling Michel Dänzer               |               http://www.amd.com
Libre software enthusiast             |             Mesa and X developer

Re: Fan management PowerMac7,2

[Martin Kukač]

On 11/20/2014 03:37 AM, Michel Dänzer wrote:
> On 19.11.2014 21:04, Martin Kukač wrote:
>> Hello,
>>
>> I was directed to this list on #ppc64/freenode IRC channel. I have
>> PowerMac7,2 (AGP, 2xPowerPC 970(2.2) 2GHz) and I wanted to try kernel
>> supporting kvm-pr module, which is not in 3.2.63 kernel provided with
>> Debian Wheezy. I downloaded 3.14.24, compiled it using original config
>> from 3.2.63 and after booting fan management does not work. I tried
>> therm_pm72 (which is deprecated, but works well with Debian kernel) and
>> windfarm_pm72 modules, but neither worked - after about five minutes
>> from boot all fans go to maximum and stay this way no matter the CPU
>> load or frequency.
>>
>> I downloaded vanilla 3.2.64, compiled it the same way and there fans
>> work with therm_p72 well. This kernel does not have kvm-pr, so I
>> reverted to original kernel provided with Wheezy.
>>
>> I looked to logs, i tried to search the web whether anyone had already
>> the same problem, but it seems that nobody else described not to say
>> solved this. Can anyone please point me to anything that would help? I
>> can provide whatever log files required.
>
> Might be the same problem as discussed in
> https://lists.ozlabs.org/pipermail/linuxppc-dev/2013-August/109700.html
> and the following posts: The i2c_powermac module doesn't get loaded
> automatically with recent kernels.
>
>

Thanks! That helped for therm_pm72 module, it works now as expected.

(It didn't help for windfarm_pm72 though, if I put it in /etc/modules 
with i2c_powermac and remove therm_pm72, fans still go to full speed in 
a few minutes. It's not problem for now, but if I understand it 
correctly, therm_pm72 is deprecated and will be removed one day, so it 
could be problem after that.)

Martin