Hollywood

https://github.com/Pyrestone/jetson-fan-ctl works good. I wrote a little script which monitors the pwm fan speed: show_fan_pwm.sh #!/bin/bash # script show_fan_pwm.sh main () { while [ 1 ]; do echo -n "fan pwn speed is : " cat /sys/devices/pwm-fan/target_pwm sleep 1 done } main $@ exit 0

The difference between armbian and nvidia ubuntu 18.04 is: nvidia ubuntu shows in /sys/class/devfreq/ 2 links: lrwxrwxrwx 1 root root 0 Jan 28 2018 54340000.vic -> ../../devices/50000000.host1x/54340000.vic/devfreq/54340000.vic lrwxrwxrwx 1 root root 0 Jun 5 18:40 57000000.gpu -> ../../devices/57000000.gpu/devfreq/57000000.gpu armbian 20.05.5_Jetson-nano_buster_legacy_4.9.140_20200528 shows in /sys/class/devfreq/ only 1 link: lrwxrwxrwx 1 root root 0 Jun 5 20:46 54340000.vic -> ../../devices/50000000.host1x/54340000.vic/devfreq/54340000.vic Here is a link https://www.jetsonhacks.com/2018/10/07/nvpmodel-nvidia-jetson-agx-xavier-developer-kit/ which decribes nvpmodel and jetson_clocks.sh (which was renamed to jetson_clocks, meanwhile) Interesting of the link above is, that the performance model can be set nvpmodel. If you take the nvpmodel program, the jetson_clocks script from nvidia ubuntu 18.04 and if you uncomment line 391 of jetson_clocks do_hotplug do_clusterswitch do_cpu #do_gpu <--- commented out at line 391 do_emc do_fan do_nvpmodel then the script seems to work. Additionally https://github.com/Pyrestone/jetson-fan-ctl should work then too. I will try it and i report it to you.

armbianmonitor -m shows a teemperature between 26 and 28 °C.

My fan is really quiet with 255. I think it depends on the fan if it is too loud or not. The temperature of my jetson nano is under 40 degrees too. In tried https://github.com/Pyrestone/jetson-fan-ctl, but it works with ubuntu from nvidia only. I tried nvidia ubuntu and the fan works really quiet and it sets the fan speed dynamically. It uses /usr/bin/jetson_clocks which produces an error on armbian but the fan starts working. Maybe, on nvidia ubuntu are some defines set which are not available on armbian. /usr/bin/jetson_clocks is used by https://github.com/Pyrestone/jetson-fan-ctl, too. The do_gpu() function of /usr/bin/jetson_clocks produces an error: Maybe, there are some environment variables about GPU not set in this section: /usr/bin/jetson_clocks line 242... for devfreq in /sys/class/devfreq/*; do name=$(tr -d '\0' <${devfreq}/device/of_node/name) if [[ "${name}" == "gv11b" || "${name}" == "gp10b" || "${name}" == "gpu" ]]; then GPU_MIN_FREQ="${devfreq}/min_freq" GPU_MAX_FREQ="${devfreq}/max_freq" GPU_CUR_FREQ="${devfreq}/cur_freq" GPU_RAIL_GATE="${devfreq}/device/railgate_enable" break fi done if [[ "${name}" == "" ]]; then echo "Error! Unknown GPU!" <------------------- this error is shown on armbian exit 1 fi

Thank you.

The simplest way is: just add the following line before last line "exit 0' in /etc/rc.local echo 255 > /sys/devices/pwm-fan/target_pwm exit 0 Another way is decribed here: https://github.com/Pyrestone/jetson-fan-ctl I currently use the simple approach.

I hava a jetson nano and i use Armbian 20.05.4 Buster. I installed a Fan with pwn, but it does not turn. https://wiki.52pi.com/index.php/ICE_Tower_Cooling_Fan_For_Jetson_Nano_SKU:_EP-0113 A command /usr/bin/jetson_clocks should enable the pwm signal. (this is mentioned for nvidia image) How can i enable the pwm signal in armbian?