[Bug 34723] Re: iMac G5 Thermal Fan Support

[Ben Collins]

Yes, there is such an option, but it does not support the newer iMac G5's. This is directly from the mouth of the PMac kernel guy (BenH).

2.6.16 supports it, but it requires so much code to be backported (entire i2c layer rewrite) that it is not feasible for dapper).
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iMac G5 Thermal Fan Support
https://launchpad.net/malone/bugs/34723