Ubuntu 20.04 Internal Microphone is not working. Input Device drop-down menu is empty in Sound settings

Recently I installed Ubuntu 20.04 on my Acer Swift 3 laptop.

The internal microphone doesn't seem to work. Input Device drop-down menu is empty in Sound settings. But the external mic from earphones is detected and works fine.

Here are a few outputs that might be helpful,

reyansh@acer:~$ cat /proc/asound/card0/codec* | grep Codec
Codec: Conexant Generic
Codec: Intel Icelake HDMI

Multimedia audio controller output from lspci -v command,

00:1f.3 Multimedia audio controller: Intel Corporation Smart Sound Technology Audio Controller (rev 30)
    Subsystem: Acer Incorporated [ALI] Smart Sound Technology Audio Controller
    Flags: bus master, fast devsel, latency 32, IRQ 164
    Memory at 601d160000 (64-bit, non-prefetchable) [size=16K]
    Memory at 601d000000 (64-bit, non-prefetchable) [size=1M]
    Capabilities: <access denied>
    Kernel driver in use: snd_hda_intel
    Kernel modules: snd_hda_intel, snd_sof_pci

Last few lines from /etc/modprobe.d/alsa-base.conf,

#Keep snd-usb-audio from beeing loaded as first soundcard
options snd-usb-audio index=-2
#options snd-hda-intel model=auto
options snd-hda-intel dmic_detect=0

I tried this but no luck. Any kind of help will be greatly appreciated. Thanks!

Edit 1: Output of sudo hdajacksensetest -a (without external mic)

Pin 0x16 (Black Headphone, Right side): present = No
Pin 0x17 (Internal Speaker, Rear side): present = No
Pin 0x18 (Not connected): present = No
Pin 0x19 (Black Mic, Right side): present = No
Pin 0x1a (Not connected): present = No
Pin 0x1d (Not connected): present = No
Pin 0x1e (Not connected): present = No
Pin 0x1f (Not connected): present = No
Pin 0x21 (Not connected): present = No
Pin 0x26 (Not connected): present = No
Pin 0x27 (Not connected): present = No

Edit 2:

Output of modprobe --show-depends snd_hda_intel

reyansh@acer:~/Documents/Keys$ modprobe --show-depends snd_hda_intel
insmod /lib/modules/5.4.0-42-generic/kernel/sound/soundcore.ko 
install /sbin/modprobe --ignore-install snd $CMDLINE_OPTS && { /sbin/modprobe --quiet --use-blacklist snd-ioctl32 ; /sbin/modprobe --quiet --use-blacklist snd-seq ; } 
insmod /lib/modules/5.4.0-42-generic/kernel/sound/core/snd-timer.ko 
install /sbin/modprobe --ignore-install snd-pcm $CMDLINE_OPTS && { /sbin/modprobe --quiet --use-blacklist snd-pcm-oss ; : ; } 
insmod /lib/modules/5.4.0-42-generic/kernel/sound/core/snd-hwdep.ko 
insmod /lib/modules/5.4.0-42-generic/kernel/sound/hda/snd-hda-core.ko 
insmod /lib/modules/5.4.0-42-generic/kernel/sound/pci/hda/snd-hda-codec.ko 
insmod /lib/modules/5.4.0-42-generic/kernel/sound/hda/snd-intel-dspcfg.ko 
insmod /lib/modules/5.4.0-42-generic/kernel/sound/pci/hda/snd-hda-intel.ko model=auto dmic_detect=0 patch=hda-jack-retask.fw,hda-jack-retask.fw,hda-jack-retask.fw,hda-jack-retask.fw 

Output of modprobe --show-depends snd_sof_pci

reyansh@acer:~/Documents/Keys$ modprobe --show-depends snd_sof_pci
insmod /lib/modules/5.4.0-42-generic/kernel/sound/soundcore.ko 
install /sbin/modprobe --ignore-install snd $CMDLINE_OPTS && { /sbin/modprobe --quiet --use-blacklist snd-ioctl32 ; /sbin/modprobe --quiet --use-blacklist snd-seq ; } 
insmod /lib/modules/5.4.0-42-generic/kernel/sound/core/snd-timer.ko 
install /sbin/modprobe --ignore-install snd-pcm $CMDLINE_OPTS && { /sbin/modprobe --quiet --use-blacklist snd-pcm-oss ; : ; } 
insmod /lib/modules/5.4.0-42-generic/kernel/sound/core/snd-pcm-dmaengine.ko 
insmod /lib/modules/5.4.0-42-generic/kernel/sound/ac97_bus.ko 
insmod /lib/modules/5.4.0-42-generic/kernel/sound/core/snd-compress.ko 
insmod /lib/modules/5.4.0-42-generic/kernel/sound/soc/snd-soc-core.ko 
insmod /lib/modules/5.4.0-42-generic/kernel/drivers/leds/trigger/ledtrig-audio.ko 
insmod /lib/modules/5.4.0-42-generic/kernel/sound/core/snd-hwdep.ko 
insmod /lib/modules/5.4.0-42-generic/kernel/sound/hda/snd-hda-core.ko 
insmod /lib/modules/5.4.0-42-generic/kernel/sound/pci/hda/snd-hda-codec.ko 
insmod /lib/modules/5.4.0-42-generic/kernel/sound/hda/snd-intel-dspcfg.ko 
insmod /lib/modules/5.4.0-42-generic/kernel/sound/soc/snd-soc-acpi.ko 
insmod /lib/modules/5.4.0-42-generic/kernel/sound/soc/intel/common/snd-soc-acpi-intel-match.ko 
insmod /lib/modules/5.4.0-42-generic/kernel/sound/hda/ext/snd-hda-ext-core.ko 
insmod /lib/modules/5.4.0-42-generic/kernel/sound/soc/sof/xtensa/snd-sof-xtensa-dsp.ko 
insmod /lib/modules/5.4.0-42-generic/kernel/sound/soc/sof/snd-sof.ko 
insmod /lib/modules/5.4.0-42-generic/kernel/sound/soc/sof/intel/snd-sof-intel-ipc.ko 
insmod /lib/modules/5.4.0-42-generic/kernel/sound/soc/sof/intel/snd-sof-intel-byt.ko 
insmod /lib/modules/5.4.0-42-generic/kernel/sound/soc/sof/intel/snd-sof-intel-hda.ko 
insmod /lib/modules/5.4.0-42-generic/kernel/sound/soc/codecs/snd-soc-hdac-hda.ko 
insmod /lib/modules/5.4.0-42-generic/kernel/sound/soc/sof/intel/snd-sof-intel-hda-common.ko 
insmod /lib/modules/5.4.0-42-generic/kernel/sound/soc/sof/snd-sof-pci.ko

Output of journalctl -b -k -p3

-- Logs begin at Wed 2020-04-01 22:53:42 IST, end at Tue 2020-08-04 12:10:16 IST. --
Aug 04 06:44:01 acer kernel: ACPI BIOS Error (bug): Could not resolve symbol [\_SB.PCI0.DGPV], AE_NOT_FOUND (20190816/psargs-330)
Aug 04 06:44:01 acer kernel: ACPI Error: Aborting method \_SB.PCI0.RP05.PCRP._ON due to previous error (AE_NOT_FOUND) (20190816/psparse-529)
Aug 04 06:44:01 acer kernel: Initramfs unpacking failed: Decoding failed
Aug 04 12:03:52 acer kernel: snd_hda_codec_generic hdaudioC0D0: The codec is being used, can't reconfigure.
Aug 04 12:04:29 acer kernel: snd_hda_codec_generic hdaudioC0D0: The codec is being used, can't reconfigure.
Aug 04 12:07:04 acer kernel: snd_hda_codec_generic hdaudioC0D0: The codec is being used, can't reconfigure.
Aug 04 12:07:10 acer kernel: snd_hda_codec_generic hdaudioC0D0: The codec is being used, can't reconfigure.

Output Devices in pavucontrol Input Devices in pavucontrol AlsaMixer Configuration when earphones with mic is not plugged in.

Solution 1:

This is a known bug in the alsa-driver. See launchpad, mint Wiki and kernel.org

At present the only option seems to be using an external microphone through USB post.

Solution 2:

Not exactly your problem but similar. In my case, laptop Toshiba Satellite L840, internal mic stopped working after I accidentaly plugged headphones in the mic port. Can't tell exactly which step fixed it, but here it goes.

1. Installed pavucontrol and reboot. (Didn't work)
2. sudo alsactl -F restore then Opened pavucontrol and changed the sound profile to another and back, and reboot. (Didn't work)
3. Plugin headphones in the mic port and reboot with it connected, now it detected at least a "wired mic", disconnected it, changed profile to "duplex internal audio" and that did it.

Hope it helps someone... Greetings