I own a TinkerBoard and DietPi OS:
Linux DietPi 4.19.57-rockchip #5.90 SMP PREEMPT Sat Jul 6 11:15:03 CEST 2019 arm
Some month ago I connected a button to a couple of pins near the video connector and, after i run the ‘echo mem > /sys/power/state’ or ‘hibernate’ commands, I was able to wake up the board.
Now, after some months and some OS update, I’m trying the suspend-wakeup operations but it does not work
The board goes down and when I press the button it is not able to wake.
I don’t remember well, but maybe the ethernet plug was flashing in the past: now it is off.