@rgl, @solidus1983 (+ others) – did any of you upgrade to the most recent firmware (and EC) versions – and if so did the changes have an impact on how the fan is operating?
(The most recent at the time of writing appears to be SD-BS-CJ41G-300-101-F. https://files.seeedstudio.com/wiki/ODYSSEY-X86J4105864/Documents/SD-BS-CJ41G-300-101-F.zip)
I am also experiencing this issue; fan does not work at all when in “Always On” mode, even when all sensors reach over 90C (194F), 5 degrees centigrade below critical point (tested with MPrime). When set to “Normal” or “Positive”, it only creates a very annoying ticking/scratching sound, and the fan is constantly “revving” up and down, without doing any real work.
Since there have been reports of firmware upgrades bricking the Odyssey, it would be extremely helpful to know for sure whether this is actually a software issue or hardware-related before attempting a fix.
Thanks for any input. 