Rock pi 4c headphone jack not recording on Linux

#1

On any linux image I tested (armbian, debian, ubuntu, manjaro…) I was not able to record audio through the 3.5mm jack. Im using a headphone with mic(headset). It does work on Android 10 and saw that there was a fix released addressing this problem ([ROM][Android10][RockPI 4] Android Q Firmware Release). I made some attempts to fix kernel errors presented by dmesg regarding sound but this had no effect on the operation of the mic.

default error on kernel 4.4.154-111-rockchip-g39b306a41b2d
$ dmesg | grep sound
[ 3.718719] of_get_named_gpiod_flags: can’t parse ‘simple-audio-card,hp-det-gpio’ property of node ‘/es8316-sound[0]’
[ 3.718727] of_get_named_gpiod_flags: can’t parse ‘simple-audio-card,mic-det-gpio’ property of node ‘/es8316-sound[0]’
[ 3.849814] asoc-simple-card es8316-sound: ES8316 HiFi <-> ff880000.i2s mapping ok
[ 3.850531] asoc-simple-card es8316-sound: ASoC: no source widget found for MICBIAS1
[ 3.851228] asoc-simple-card es8316-sound: ASoC: Failed to add route MICBIAS1 -> direct -> Mic Jack
[ 3.852044] asoc-simple-card es8316-sound: ASoC: no sink widget found for IN1P
[ 3.852692] asoc-simple-card es8316-sound: ASoC: Failed to add route Mic Jack -> direct -> IN1P

#2

Its working when I change the “Differential Mux” to “lin2-rin2” in alsamixer but the definitions are not being stored. alsactl store doesn’t work and using ucm( ALSA Use Case Manager configuration) it does keep the configurations but the mic stops working after reboot unless you reset “lin2-rin2” manually again.