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I was able to prevent the auto-reset by disabling thermal_zone0 on the board. got the idea from: https://forum.pine64.org/showthread.php?tid=6276&pid=45169#pid45169 After setting the mode to 'disabled', the pwm1 does not get reset anymore. Note that the next reboot will reset the value to 'enabled'. To make it permanent, I added a udev rule as suggested here: https://forum.manjaro.org/t/persisting-change-to-sys-class-thermal-thermal-zone-mode/53556 The rule in the post didn't work for me however and I went with: KERNEL=="thermal_zone0", SUBSYSTEM=="thermal", ATTR{mode}="disabled"

I'm experiencing the same thing after installing Debian Bookworm on RockPro64. The golden number to keep the fun running in my case is 99, anything above gets reset to 0. If I intentionally stress the CPU enough to drive high temperatures, the fan kicks in automatically with a value of 100, but that's too slow in my case. This is without any utilities like fancontrol installed.