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ti8168 audio problems



hi !

SDK = ezsdk502(latest)  

base board = ti8168

in order to test audio interface on the base board

frist > operate alsamixer cmd to turn up the sound

second > operate aplay cmd to playback audio (aplay alsa.wav)

                   but i  can only hear from HP OUT interface   LINE OUT hear nothing  

third > operate arecord cmd to capture audio (arecord alsa.wav)

                    but  only LINE IN can capture audio  MIC can not

why ???????????????????????????????????

does i  have to configure the alsa before operate aplay/arecord cmd ?

if    how ?