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hholtmann / smcFanControl

Control the fans of every Intel Mac to make it run cooler
GNU General Public License v2.0
2.41k stars 303 forks source link

Forced Fan Speed(F0Tg) can Exceed Posted Max (F0Mx), but Cannot Write/Change Max Speed #121

Open H3liusAur3lius opened 3 years ago

H3liusAur3lius commented 3 years ago

Hi All, a few weeks ago my SMC spontaneously reduced my Maximum fan speed from 3600, to ~2600 (it changes day to day +/- 75 RPM).

I was finally able to override this using these command line smc-commands sudo ./smc -k "FS! " -w 001 sudo ./smc -k F0Tg -w 3840

However, when I try to update the Maximum threshold (sudo ./smc -k F0Mx -k 3840), it doesn't update anything in the SMC, and thus when I run the smcFanControl app, it only sees the 2600 upper limit and pulls the fan speed back down.

I'm not getting any error codes or any indication that the command isn't working. Any idea why it's not saving the new max fan speed or how to fix this?

mkdj77 commented 3 years ago

Hey I'm also trying... I used the HWMONITORSMC2 and the system started making noise but my bios are showing RPM and temp as usual I'm on hackintosh... I want to try reducing the fan speed and see if the noise is going

EverlastEngineering commented 2 years ago

I'm seeing this too. I can set the minimum, F0Mn, higher than the maximum but I can't seem to change the maximum.

I have noted that recently in MacOS (past 6 months perhaps?) the maximum seems to vary. It can go higher than the previous maximum, and so I suspect something is constantly writing to the maximum thus overwriting any changes put there.

It's too bad because I want to make an auto profile that sets the system to auto mode with a 100% PWM maximum on the fan to get the most performance without doing this manually.

EverlastEngineering commented 2 years ago

Note you cannot lower the maximum speed either.

krackers commented 1 year ago

@EverlastEngineering Yup I'm seeing the same thing on a macbook pro. I guess one option is to just make a script that toggles between manual control and auto after a threshold. I haven't found any other way to override the minimum below the defaults.