Fan loud when system resume

[ruei_chang]

Hello,

I’ve noticed that the fan becomes loud sometimes when my machine resumes from suspend.

I have followed Fan control to set up my nvfancontrol.conf

Here is my
nvfancontrol.conf (1.2 KB)

There is a “Suspend” option under “Power Off/Log Out,” which I used to test the suspend/resume action. Sometimes, the fan becomes loud when I press the power button to resume the system. This loud noise lasts for approximately 0 to 0.5 seconds. It’s not too long, but it is unusual.

I’m using a custom OS (Jetpack 6.2).Not install prebuilt OS via SDKManager.

Has anyone else encountered this issue?

[KevinFFF]

Hi ruei_chang,

Are you using the devkit or custom board for Orin Nano?

@ruei_chang

I’m using a custom OS (Jetpack 6.2)

Do you mean that you are using custom BSP package?
If so, what’s your customization relating to power and the fan?

Please also share the full dmesg to check if there’s any error reported.

[ruei_chang]

Hello,

Are you using the devkit or custom board for Orin Nano?

I’m using custom board.

Do you mean that you are using custom BSP package?

I have downloaded the Linux_for_Tegra and doing driver porting.

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I noticed the fan became loud suddenly after resuming from suspend might not the driver issue.
Because I removed the pwm_fan driver and stopped the nvfancontrol.service. I could see the fan stopped, but after I suspended and resumed again, the fan started working. In the meantime, I’m 100% sure that my pwm_fan driver and nvfancontrol service are stopped.(This behavior is same as devkit.)

I think my main question is: Is there a reason the fan would still work even when the pwm_fan driver and nvfancontrol service are being stopped?

Here is my
dmesg.txt (130.8 KB)

[ruei_chang]

I’ve also noticed that I can’t enter suspend mode quickly after resuming.

If I wait about 10 seconds after resuming and then suspend/resume again, the fan doesn’t make a loud noise.

However, if I don’t wait and quickly suspend after resuming, the fan becomes loud.

I assume most users wouldn’t perform the same test as I did, so I believe this problem can be considered closed.