I have an arduino running Serial.println and I never get the output on my raspberry pi when it is connected. It does create the device in /dev and looks like it should work but I never get any output. I whittled down my arduino program to the point where it literally did nothing but hello world once a second, and I still never see the output. Using my PC and the arduino IDE, serial monitor shows the output I am looking for.
What gives? I swear this worked six months ago, too. Maybe kernel/raspbian changes getting in my way?