In my Orange Pi One with ARMBIAN 5.27.170422 nightly Ubuntu 16.04.2 LTS 4.10.11-sun8i
I install acpi:
sudo apt-get install acpi
And nothing is show when I press the power button.
Is normal or my button is damaged?
But at least evtest worked for you, that's better than nothing :)
Have you upgraded Armbian since then? (your message is one year old).
And does evtest still work for you?