Thank you for the loopback idea. I tried it and it is not working o my evm335x
If I try the same loopback on my Ubuntu machine, it works fine. I can hear form speaker, the sound that going into Microphone. My Ubuntu runs the same linux version as my evm335x board.
I tried amixer cmds to mute/unmute Mic and it did not help. Same commands can mute/unmute Mic on my ubuntu.
audio output on my evm335x work fine if I just play (aplay) an audio file
Anymore ideas?
Thanks