Unexplained board temperature chart for NanoPi NEO3.


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I'm running Armbian 20.08.1 (Ubuntu) in NanoPi NEO3, and after running sbc-bench,sh benchmark, the temperature does not revert to the idle temperature for several hours until exactly 4am.

NanoPi-NEO3-Sudden-Temperature-Drop.png.a7ed8331787d3605240d3ef4d87afd7f.png

 

The system was idle all that time, until a small CPU usage spike at 4am. That's because it rebooted at that time, maybe due to a short power failure.

 

 

CPU-usage-4am.png.547ccfd2d7226fd0b82d52879af44328.png

 

So what confuses me a lot is why the idle temperature will get back to around 60C only after a reboot. 11 hours of idle time would not do it, but a simple reboot would magically drop the temperature by close to 15C.

 

 

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