On Vine Linux on PowerMac G4 Dual (Mirrored Drive Doors), I wrote:
さぞかし排気やファンの音がうるさいんだろう，と覚悟していたのですが，意外や意外，充分静かでした．
However, this machine is rather silent enough against my expectation
全くのウソでした... こいつごっつうるさいわ．
It was just my misunderstanding... I found this machine pretty noisy!
で，drivers/macintosh/therm_windtunnel.c なるドライバの存在に気付く:
After a while, I noticed the driver drivers/macintosh/therm_windtunnel.c:
* The G4 "windtunnel" has a single fan controlled by an
* ADM1030 fan controller and a DS1775 thermostat.
*
* The fan controller is equipped with a temperature sensor
* which measures the case temperature. The DS1775 sensor
* measures the CPU temperature. This driver tunes the
* behavior of the fan. It is based upon empirical observations
* of the 'AppleFan' driver under Mac OS X.
* WARNING: This driver has only been testen on Apple's
* 1.25 MHz Dual G4 (March 03). It is tuned for a CPU
* temperatur around 57 C.
BenH さんが [PATCH] pmac: Improved G4 "windtunnel" fan controller というのを投げておられるのもメモ．
Personal reminder: BenH's post of [PATCH] pmac: Improved G4 "windtunnel" fan controller.
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