Since Linux v5.10 it is a bit complicated to get it working. Try this:   # Reset and re-initiate ALSA mixer states rm /var/lib/alsa/asound.state alsactl init # Enable 3.5mm output amixer -c 0 set 'TOACODEC OUT EN' 'on' # Use I2S B as source for 3.5mm output, I2C A is somehow not usable amixer -c 0 set 'TOACODEC SRC' 'I2S B' # Use ALSA device 0 as input for I2S B amixer -c 0 set 'TDMOUT_B SRC SEL' 'IN 0' # Enable I2S B (SRC 2) on device 0 (_A) amixer -c 0 set 'FRDDR_A SRC 2 EN' 'on' # Set