Cooling Fan Configuration

VIM3
1

Which Khadas SBC do you use?

VIM3

Which system do you use? Android, Ubuntu, OOWOW or others?

Ubuntu Server 22.04

Which version of system do you use? Khadas official images, self built images, or others?

Official Khadas image for Ubuntu Server 22.04

Please describe your issue below:

Hi. I just installed the 3705 Cooling fan on my VIM3 and I’m using it in auto mode. Apparently, auto mode keeps the temperature at 50 °C. But i want to keep it at 40 C. How can i do this? I also want to change the fan speed for low mode. Is this possible?

P.S: I tried to set trigger temperature by following the instructions on [VIM3/3L Cooling Fan [Khadas Docs]] and i tried to run this command:
echo 40 | sudo tee /sys/class/fan/trigger_temp_low
but I realized that I don’t have a directory called ‘fan’ in /sys/class/.

Thank you in advance.

2

Hi there @whxper ,

Which kernel version are you using ? showing the outputs of uname -a and lsb_release -a would be helpful.

for setting low fan speed by default, you can modify /boot/env.txt
and set this parameter:

fan_mode=auto → fan_mode=low

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cheers

3

Thank you for your reply!
This should be helpful i think.

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