Tested Kernel 4.4-rc3 with the Odroid U3, and – finally – the fan works correctly.. Kernels from 4.2 onward booted successfully, but the fan ran continuously… And now I can add the U3 to the (small!) list of my ARM devices that work with the standard unpatched kernel.org kernel (the others are the DreamPlug (ARMv5) and the CuBox i4-Pro (ARMv7)..
Fedora 23 (Twenty Three) Kernel 4.4.0-rc3 on an armv7l (ttySAC1) .............]# uname -a Linux rgodroid 4.4.0-rc3 #1 SMP PREEMPT Mon Nov 30 13:03:03 PST 2015 armv7l armv7l armv7l GNU/Linux
Details of changes from -rc2 are here: http://lkml.iu.edu/hypermail/linux/kernel/1511.3/03588.html
Robert Gadsdon. December 3, 2015.