hi, > As long as you make sure there's some code to switch the fans to full > speed at some threshold you should be safe. The module needs some more > tweaking anyway - it's written for iBook where there's a CPU and GPU fan > but the PowerBook seems to have just two exhaust fans, and the sensors > don't sit on the CPU and GPU, exactly (the 'GPU' sensor really measures > the power supply temp). For me, the 'GPU' limit needs to be reduced or > both fans need to be synced to identical speed to keep the machine from > crashing too often. Depending on your sensor and fan locations, you might > benefit from similar tweaks (list the fan node in the OF device tree, > mine's at uni-north/i2c/fan).
hmm, I'm a bit puzzled right now: according to the given location in the OF device tree, I have only one fan in my 12" powerbook, located at the "REAR MAIN ENCLOSURE"... anyways, if you have 2 exhaust fans, it would make sense to set the limit to min(cpu_limit, gpu_limit) for both of them... however, if I'm not mistaken, a temporary workaround for this would be to tamper with lines 46,47 in therm_adt746x.c and recompile the module (line 47 seeming to be the more relevant one). > Making the fan start out slower and gradually increasing the speed would > be just a minor add-on :-) message received, I'll look into that... it would probably be nice to have another module parameter like "fan_step" and "limit_override", so that when the temperature reaches "limit", the fan speed is set to fan_speed and then gets increased by fan_step every one or two degrees until limit_override is reached which would in turn set the fan to full speed. does anybody know how OS X handles the fan speed i.e. at which temperatures does it start the fan(s), what increments does it use and when does it go to full speed? regards, Georg Kaindl
