![]() Just to be really damn sure, I fired up the app, checked the F.F bit's value in SMCExplorer (`0`), forced the first fan's speed to a given value in macsFanControl, checked again the bit's value (became `1`), then stopped macsFanControl and checked again (fell back to `0`). *: not that I personally plan on working on this, but who knowsĮDIT : Okay, downloaded macsFanControl, dumped its _TEXT segment – it does contain the telltale `FS! ` string (matching the fan force bit's SMC key). during testing, should we implement use of the fan force bit. You need to disable the option to have Macs Fan Control run at boot, then follow the instructions in the new how-to section to use smcFanControl to set your fan. Obviously, these are cases we don’t wanna reach, but it may be reassuring to know they’re here in case we* mess up, esp. And if the TjMax (the CPU’s nominal maximum operation temp) is reached, it will signal prochot and immediately shutdown, in order to protect itself. It does seem to lack any kind of failsafe, but anyway, the CPU will underclock itself to reduce the heat to be dissipated if a given temp is exceeded. It's worth complaining to Apple though, because it's ridiculous. Unless there's an undocumented setting for forcing the SMC to keep the fan on, there's nothing software like smcFanControl can do about it. You will get prompts about that software has been downloaded from the internet and so on. The end result is that the system will throttle itself and slow down severely when it gets hot instead of turning the fan on and getting rid of the heat. dingonv hholtmann Delete the existing smcFanControl.app Redownload it from the web and unzip it. Negative air pressure: More fans are blowing air out of the case than drawing air in, causing a slight vacuum effect. Even then, the fan speed is unreasonably conservative unless I set it higher manually. Assuming all the fans are the same size and speed, then you have one of three possible options for the air pressure inside the case: Positive air pressure: More fans are drawing air into the case than blowing air out of the case. Once they turn off, they generally don't come back on until the CPU is 140F+, and I've seen them still failing to spin until the CPU is near 180F. ![]() basically, it can monitor/ set your fans speeds and. This makes sense if the goal is to avoid having the fans constantly turning on and off every 30 seconds, although all they've accomplished is to make the interval longer, they still cycle on and off over and over. next, go to the fan control tab and set up a temperature curve for each fan. It appears that there is a timer in the SMC firmware on 2015+ Macbook Pro models, if the temperature is below a specific point and the fan has been on for longer than a few minutes, they turn off and can't be turned back on until the temperature goes up again. The behavior is the same whether the machine is using battery power or plugged in. I'm convinced that Apple is either trying to make the machine near silent even when it's too hot to justify leaving the fan off, or trying to prolong the life of the fan. 4.
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