Hi,
dleidert, mi-hol, it is quite interesting to read your comments.
Let me still refer to my picture at top of the thread. Unfortunately the armbian monitoring is not included, but the "htop"-output is there. It shows (in the background of the error-messages), that the big-cores are all at zero, the little-cores are at zero, except one with 2.6% load. Also there is a value
"load average" with 0.33 0.17 0.15. Since the xu4 is only used for NAS, and shutdown happend in the morning, there was no reason to overheat.
Mechanically there have been no changes and an external Desktop-Fan is blowing additionally to the SoC-mounted fan.
What I also assume is, that I know from the shutdown messages, that thermal zones 0 and 1 are describing the faulty sensors, is't it ? If I understand correct, zone 0 and 1 describe the big-little cores...
(see appendix from kernel coders)[PATCH] ARM_ dts_ exynos_ Exynos5422 Odroid-XU_ incomplete thermal-zones definition.pdf
(but let's say, I do not really understand the kernel path discussion)
Goal for me is, to have a working controller for my NAS, not shutting down every 1 to 2 days.
The workaround to just disable the thermal zone sensors
echo disabled > /sys/devices/virtual/thermal/thermal_zone1/mode
and use the last hints of mi-hol, to manually adjust the internal fan (and using additionally external fan) seems to be a good solution.
Mechanically it could be even better to remove the internal fan and using passive cooling block with external fan (like XU4q); I do not trust that little fan in long term usage...
dleidert : as you said yourself, your hints about the sensor reading where not really usable, but I have tried...
Thank you for all your time so far, Pollin sent a message, that my workaround is on the road...