How are RPM GPU fan values retrieved by psensor?

[ricciolino]

How are RPM GPU fan values retrieved by psensor?

I need a simple way to retrieve it with a command line base utility. Please can you pointing me out which is the piece of code responsible for obtain these values? Which is, under the hood, the nvml call toward the GPU driver to get exactly the live RPM values of the fans?

I already try though a simple python3 script using the following API: py3nvml.nvmlUnitGetFanSpeedInfo

But doesn't work for my RTX 3080 (Driver version 525.85.05). It say: py3nvml.py3nvml.NVMLError_InvalidArgument: Invalid Argument