PWM is not working normally

Hello, everyone:
I used NX output PWM to fan, the same config as the original carrier board. tegra_pwm6 GPIO14(PH.01), but when i used the command cat /sys/kernel/debug/pwm, it show

platform/32d0000.pwm, 1 PWM device
 pwm-0   (pwm-fan             ): requested enabled period: 45334 ns duty: 0 ns polarity: normal

and the sound of the fan is very large.
So what should i do next? thank you.

best reagrds,
ultwcz1997

hello ultwcz1997,

may I know which JetPack release version you’re working with,

are you running heavy loaded program?
what’s the thermal condition, please also enable $ sudo tegrastats to gather processor reports.
besides, could you please refer to developer guide for Fan Speed Control.
thanks

Hi, JerryChang,
Thank you reply. I am so sorry to reply slowly.

1.may I know which JetPack release version you’re working with?

Jepack4.4 R32.4.3

2.are you running heavily loaded program?

maybe, i will try to disable some processes.

3. $ sudo tegrastats

RAM 3682/7771MB (lfb 884x4MB) SWAP 0/3886MB (cached 0MB) CPU [22%@1420,26%@1420,25%@1420,26%@1420,26%@1420,30%@1420] EMC_FREQ 9%@1600 GR3D_FREQ 78%@1109 APE 150 MTS fg 0% bg 15% AO@27C GPU@29C PMIC@100C AUX@28C CPU@30C thermal@28.75C VDD_IN 6560/6560 VDD_CPU_GPU_CV 2640/2640 VDD_SOC 1357/1357

RAM 3683/7771MB (lfb 884x4MB) SWAP 0/3886MB (cached 0MB) CPU [25%@1420,25%@1420,21%@1420,24%@1420,25%@1420,25%@1420] EMC_FREQ 9%@1600 GR3D_FREQ 0%@1109 APE 150 MTS fg 0% bg 12% AO@27C GPU@29C PMIC@100C AUX@28C CPU@29.5C thermal@28.75C VDD_IN 6400/6480 VDD_CPU_GPU_CV 2520/2580 VDD_SOC 1317/1337

RAM 3683/7771MB (lfb 884x4MB) SWAP 0/3886MB (cached 0MB) CPU [23%@1420,21%@1420,26%@1420,28%@1420,27%@1420,22%@1420] EMC_FREQ 9%@1600 GR3D_FREQ 0%@1109 APE 150 MTS fg 0% bg 13% AO@27C GPU@29C PMIC@100C AUX@28C CPU@29.5C thermal@28.95C VDD_IN 6360/6440 VDD_CPU_GPU_CV 2480/2546 VDD_SOC 1317/1330

RAM 3684/7771MB (lfb 884x4MB) SWAP 0/3886MB (cached 0MB) CPU [25%@1420,25%@1420,27%@1420,21%@1420,23%@1420,27%@1420] EMC_FREQ 9%@1600 GR3D_FREQ 0%@1109 APE 150 MTS fg 0% bg 14% AO@27C GPU@29C PMIC@100C AUX@28C CPU@29.5C thermal@28.75C VDD_IN 6320/6410 VDD_CPU_GPU_CV 2480/2530 VDD_SOC 1317/1327

The main problem is the sound of the fan is large when i boot at first.

hello ultwcz1997,

fan is setting to full speed while system boot-up, it should behavior normally after you enter ubuntu desktop.
you may see-also Maximizing Jetson Nano or Jetson TX1 Performance, if you running jetson_clocks script to maximize Jetson Nano performance by adding --fan options. it’ll also set the maximum PWM fan speed.

Ok, thank you.

hi, JerryChang,
BTW, how to disable the maximum PWM fan speed? thank you.

fan rpm will configured automatically as long as you’re not running jetson_clocks script with --fan options.

1 Like

Thank you, it is ok.

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