Weird fan behavior

Question

Weird fan behavior

Opened this issue 4 years ago · 5 comments

Hi again.

Could you tell me, whether in your case Noctua NF-F12 5V PWM 120mm fan works correctly?
I have the issue, that after the system start, it spins with constant RPM (<400) and doesn't react to temperature changes.

More details here: https://forum.odroid.com/viewtopic.php?f=168&t=41565&p=318992

Answer 1 · 2021-01-20T08:52:03.000Z

Hey, The fan is working fine for me, it remains off until the temperature hits the threshold and then it spins up until the temperature drops down again. I’m not at my computer right right now, but I’ll have a look what I have my bios settings are and post back 👍🏻 Thanks Matt

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On Wed, 20 Jan 2021 at 06:47, strange_v ***@***.***> wrote: Hi again. Could you tell me, whether in your case Noctua NF-F12 5V PWM 120mm fan works correctly? I have the issue, that after the system start, it spins with constant RPM (<400) and doesn't react to temperature changes. More details here: https://forum.odroid.com/viewtopic.php?f=168&t=41565&p=318992 — You are receiving this because you are subscribed to this thread. Reply to this email directly, view it on GitHub <#2>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/AA7AEX3TMPRY7E3WUIWWFN3S2Z4ABANCNFSM4WKGEE5Q> .

Answer 2 · 2021-01-20T08:58:44.000Z

Thank you, Matt.

It'll be cool if you can execute these commands after the fan starts spinning:

# modprobe emc2103
# sensors

The last command requires lm-sensors
# apt install lm-sensors

Answer 3 · 2021-01-22T11:15:51.000Z

Matt, I solved my problem with a DIY adapter, so now it works.

But I'm curious, whether it's a common issue (it should be) or just a single case. So please, execute the commands above when you have time.

Thank you.

Answer 4 · 2021-01-22T20:39:35.000Z

My fan so rarely starts up, it’s been difficult catching it. I will when I can. How had you previously connected it? What is your DIY adapter now? Many Thanks Matt

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On Fri, 22 Jan 2021 at 11:16, strange_v ***@***.***> wrote: Matt, I solved my problem with a DIY adapter, so now it works. But I'm curious, whether it's a common issue (it should be) or just a single case. So please, execute the commands above when you have time. Thank you. — You are receiving this because you commented. Reply to this email directly, view it on GitHub <#2 (comment)>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/AA7AEXYJXEQZKN2TKNDSWELS3FM7LANCNFSM4WKGEE5Q> .

Answer 5 · 2021-01-22T21:11:50.000Z

Previously it was connected directly to the board (as it should be if everything is okay).
Now I'm using a small MCU in the middle (fan's tacho output connected to the MCU), the logic is simple:

if the fan spins, but RPM < 500 - emulate 500 RPM signal
if the fan's RPM >= 500 - emulate the signal for the actual speed
if the fan doesn't spin at all - do nothing (no signal)

According to the emc2103 datasheet (our board uses it as a fan controller), it cannot recognize speed below 500 RPM but during the fan startup, emc2103 spins it with 20% speed (around 300 RPM).

UPD
An easy way to increase the CPU temperature
stress-ng --cpu 0 --cpu-method fft