On 02/22/2014 02:51 AM, Erik de Castro Lopo wrote: > 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. My experience is that loading the i2c drivers on kernel 3.12 on a G5 makes the fans calm back down. I don't remember the name of the module exactly, but it's something like powermac-i2c.ko or i2c-powermac.ko (i don't have the machine in front of me), so "modprobe -v powermac-i2c" or "modprobe -v i2c-powermac" should do it. hth, --dkg
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