N2+ with fan

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N2+ with fan

Post by romadu »

Hi
I have N2+ with emmc Linux and have installed the fan module, but the fan never seems to turn on, even though the device gets hot. How is the fan configured or controlled?

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Re: N2+ with fan

Post by tobetter »

What's the output of uname -a in your Linux?

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Re: N2+ with fan

Post by rooted »

What do you consider hot?

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Re: N2+ with fan

Post by romadu »

tobetter wrote:
Fri Nov 18, 2022 6:16 pm
What's the output of uname -a in your Linux?
Linux odroid 4.9.312-125 #1 SMP PREEMPT Sat Jun 18 18:58:41 UTC 2022 aarch64 aarch64 aarch64 GNU/Linux

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Re: N2+ with fan

Post by romadu »

rooted wrote:
Fri Nov 18, 2022 7:13 pm
What do you consider hot?
The chassis is hot to touch

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Re: N2+ with fan

Post by rooted »

romadu wrote:
rooted wrote:
Fri Nov 18, 2022 7:13 pm
What do you consider hot?
The chassis is hot to touch
If the heatsink is actually hot this is a good indicator.

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Re: N2+ with fan

Post by odroid »

Try reading the CPU temperature on the command line.
cat /sys/devices/virtual/thermal/thermal_zone0/temp

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Re: N2+ with fan

Post by mctom »

I remember N2+ had quite high default thresholds, my N2+ fan never started in my climate. I modified thresholds so it would.
The actual CPU temp will give the answer, as @odroid instructed above.
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Re: N2+ with fan

Post by romadu »

mctom wrote:
Sat Nov 19, 2022 11:03 pm
I remember N2+ had quite high default thresholds, my N2+ fan never started in my climate. I modified thresholds so it would.
The actual CPU temp will give the answer, as @odroid instructed above.
Thanks, how did you modify the default thresholds?

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Re: N2+ with fan

Post by mctom »

By modifying values in trip point files, such as /sys/devices/virtual/thermal/thermal_zone0/trip_point_x_temp
Each trip point activates different cooling mechanism (fan, throttling etc), so it's a good idea to read their values first and then write new values.
Note these modification won't persist through reboot, so you'll have to make a script that modifies them on startup.

But first, please answer the question by @odroid and tell us what's your CPU temperature.
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