Originally Posted by tlrowley
ETA - FBKindle - that's what - when I stopped it (not just switched back to the Kindle framework) the ping started working.
the only special thing that happens when fbKindle stops is that the [Qt keyboard]
driver stops grabbing /dev/input/event0 , /dev/input/event1 (and /dev/input/event3 -- on K3).
The source code is publicly available here
Please see under drivers/KindleKeyboard , if needed