I'am running a PiOne with 4.14.14 Stretch.
I have installed acpid and give the command acpi_listen
When pussing the button in Stretch and I didn't see any logging.
With the old kernel in 5.38 Jessie on the same PiOne I saw
button/power PBTN 00000080 00000000
button/power PBTN 00000080 00000000
button/power PBTN 00000080 00000000
In the output of
dtc /boot/dtb/sun8i-h3-orangepi-one.dtb
I saw
key_pins@0 {
pins = "PL3";
function = "gpio_in";
linux,phandle =