[Bug 17272] iMac G5 will freeze after booting up

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Thu Dec 1 15:32:46 UTC 2005

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------- Additional Comments From f.taiani at computer.org  2005-12-01 15:32 UTC -------
(In reply to comment #10)
> Same problem on my iMac G5 1.8GHz. Disable the sound daemon seems to be a
> workaround. But after login, the fan starts up full speed.

This is due to newer monoprocessor G5 models using a new chipset for their cooling/power infrastructure. After a few seconds the firmware detects 
there is no driver for the fans and kicks them into full speed for safety. The new infrastructure is called SMU and replaces the old PMU. Ben 
Herrenschmidt (the main kernel developper for the ppc port) has been working on this. Experimental support for the SMU chipset should now be 
available in the most recent kernels (>= 2.6.15, to be double-checked): see

http://lists.debian.org/debian-powerpc/2005/09/msg00542.html and

for more details.

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