Bug#713943: Lack of i2c_powermac module may be the cause
On Feb 22, 2014, at 12:23 AM, Erik de Castro Lopo <erikd@mega-nerd.com> wrote:
> Hi,
>
> I run debian testing on a dual G5 powermac.
>
> Just upgraded from linux-image-3.4-trunk-powerpc64 to
> linux-image-3.12-1-powerpc64 and found the same issue. The windfarm
> modules are loading but the about 30 seconds to a couple of minutes
> after booting to 3.12-1-powerpc64 the fans speed up to full speed.
>
> lsmod says the windfarm modules are being loaded, and its the same
> modules being loaded under the 3.4 kernel.
>
> I have however found a difference. On 3.12 I get:
>
>> dmesg | grep windfarm
> [ 4.358299] windfarm: initializing for dual-core desktop G5
>
> whereas on 3.4 I get:
>
>> dmesg | grep windfarm
> [ 4.791589] windfarm: initializing for dual-core desktop G5
> [ 9.077416] windfarm: CPUs control loops started.
> [ 12.440957] windfarm: Backside control loop started.
> [ 12.491701] windfarm: Slots control loop started.
> [ 12.592933] windfarm: Drive bay control loop started.
>
> Definitely something wonky there.
>
> Erik
> Erik de Castro Lopo wrote:
>
>> Hi,
>>
>> A previous message in this bug suggested that the i2c_powermac module
>> may be involved.
>>
>> I can confirm that this module is missing completely for the 3.12 kernel
>> (there is no module of that name in the /lib/modules/3.12-1-powerpc64/
>> tree) whereas for the 3.4 kernel this module is available and is being
>> auto-loaded.
>
> It seems that the i2c_powermac module from 3.4 is now called i2c-powermac
> (underscore replaced with a minux sign).
>
> Manually loading the i2c-powermac module results in fans that run at the
> normal. expected low speed. I will be adding this to /etc/modules as a
> workaround for this issue.
>
> A question about kernel modules, can one module (eg windfarm_core) be
> made to depend on and auto-load another (eg i2c-powermac)?
>
> Erik
> --
> ----------------------------------------------------------------------
> Erik de Castro Lopo
> http://www.mega-nerd.com/
>
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>
I'm forwarding this to the debian-powerpc list, incase someone there can help!
Rick
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