You added this line to /etc/modprobe.d/alsa-base.conf:
options snd-intel-dspcfg dsp_driver=1

That will disable the built-in (digital) mic. 
https://thesofproject.github.io/latest/getting_started/intel_debug/introduction.html#pci-devices-introduced-after-2016
So what caused you to add that line? Now all you have is analog mic from the 
jack:

ARECORD

**** List of CAPTURE Hardware Devices ****
card 0: PCH [HDA Intel PCH], device 0: ALC294 Analog [ALC294 Analog]
  Subdevices: 1/1
  Subdevice #0: subdevice #0

If you remove the snd-intel-dspcfg line, run 'sudo update-initramfs -u
-k all', and reboot, you should have dmic devices in arecord output too.


** Summary changed:

- [HDA-Intel - HDA Intel PCH, recording] No sound at all
+ [Asus Q540VJ, HDA Intel PCH, recording] No sound at all

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https://bugs.launchpad.net/bugs/2111623

Title:
  [Asus Q540VJ, HDA Intel PCH, recording] No sound at all

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