Ubuntu 20.04 - init i915 and HDMI codec failed

This one has some driver tweaks that look good:
https://askubuntu.com/questions/1220493/18-04-audio-realtek-alc3254-fails-on-new-dell-g3-15-3590

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Adding snd_hda_intel.dmic_detect=0 to grub parameters made all kernels load the correct driver. However the problem with microphone persist, system don’t recognize internal microphones.

Did you also try the second one?
Another approach:
https://askubuntu.com/questions/1226805/xubuntu-only-shows-dummy-output-for-audio-unless-i-plug-in-a-hdmi-then-i-can-us

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I tried different combinations of conf. From both links and from sound - Microphone is not working on Ubuntu 16.04 - Ask Ubuntu also. The best I could get was with just options snd-hda-intel model=headset-mic in alsa-base.conf, the audio works pretty good and the settings too, intern mic is available, with or without headphones pluggled, however it don’t detect any sound (with or without hedphones). Already checked alsamixer and pavucontrol, nothing seems wrong. Tried a phone with mic and it didn’t detect the mic.

Only thing left might be installing latest 5.6 kernel and hope it’s fixed there.

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Its okay to install 5.6 kernel in a 18.04 ubuntu version?

Should be no problem, at least for testing. You’ll need to download and install
kernel headers
https://kernel.ubuntu.com/~kernel-ppa/mainline/v5.6.14/linux-headers-5.6.14-050614_5.6.14-050614.202005200733_all.deb
kernel image specific headers
https://kernel.ubuntu.com/~kernel-ppa/mainline/v5.6.14/linux-headers-5.6.14-050614-generic_5.6.14-050614.202005200733_amd64.deb
kernel image
https://kernel.ubuntu.com/~kernel-ppa/mainline/v5.6.14/linux-image-unsigned-5.6.14-050614-generic_5.6.14-050614.202005200733_amd64.deb
modules
https://kernel.ubuntu.com/~kernel-ppa/mainline/v5.6.14/linux-modules-5.6.14-050614-generic_5.6.14-050614.202005200733_amd64.deb

Got some errors on installation:

ERROR (dkms apport): kernel package linux-headers-5.6.14-050614-generic is not supported
Error! Bad return status for module build on kernel: 5.6.14-050614-generic (x86_64)

W: Possible missing firmware /lib/firmware/rtl_nic/rtl8125a-3.fw for module r8169
W: Possible missing firmware /lib/firmware/rtl_nic/rtl8168fp-3.fw for module r8169

I’ll try boot it anyway

It booted normally, but nothing changed, still no sound being captured. Should I try remove the parameters I added on grub and alsa-base.conf ?

Yes, please try removing those.

Not good, only dummy output again

Then you can only revert to the Ubuntu bug tracker, don’t know if a bug report has already been created there.

@poccia - idk if you were able to solve it, but I found someone on manjaro forums who found a solution.

Were you able to get everything working on Ubuntu 18.04 or 20.04?

I’m using 18.04, but still with a problem in my internal mic (I described it here pulseaudio - No sound detected by the internal microphone on a dell laptop - Ask Ubuntu). Havent’ try solving it for a while. Basically, my internal mic don’t work when I plug a headphone.