Ok, my current test results:
- /boot/config.txt is exactly same as recommended in the
- 1 wire based temp sensor is working
- All 8 channel 12V relay/power controller is working
- 10 v pwm/0-10v still not working as expected. I am not sure whats going on. At least on linux side i can see the proper params (period and dutycycle for both pwm channels).
I'll start testing with oscilloscope (in case this is frequency related) and then trace the pcb with multi meter tomorrow.
Also, what is your kernel version? The exact parameters have changed between Jessie and Stretch kernels IIRC.