If the Jetson TK1 audio is not available, you can enter the following command at the terminal and test again, you can use it. (Note: On the Jetson TK1 hardware, on the audio, above is the microphone, below is the handset).
Amixer cset name= "Stereo ADC MIXL ADC2 Switch" 0amixer cset name= "Stereo ADC mixr ADC2 Switch" 0amixer cset name= "Int Mic Switch "0amixer cset name=" ADC Capture Switch "1amixer cset name=" RECMIXL BST1 Switch "0amixer cset name=" Recmixr BST1 Swi Tch "0amixer cset name=" RECMIXL BST2 switch "1amixer cset name=" recmixr BST2 switch "1amixer cset name=" Stereo ADC L1 Mux " "ADC" Amixer cset name= "Stereo ADC R1 Mux" "ADC" Amixer cset name= "Stereo ADC MIXL ADC1 Switch" 1amixer cset name= "Stereo A DC mixr ADC1 Switch "1amixer cset name=" Stereo ADC MIXL ADC2 switch "0amixer cset name=" Stereo ADC mixr ADC2 switch "0amix ER cset name= "IN1 mode Control" "Single ended" Amixer cset name= "IN2 Mode Control" "Single ended" Amixer cset name= "Mic Jack Switch "1
NVIDIA Jetson TK1 Learning and development: How to troubleshoot input and output audio issues