The solution listed here works for my case above:

** Bug watch added: #2460

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  Internal microphone realtek ALC257 is not working in 24.04 Noble
  (Fujitsu WU4/H1)

Status in alsa-driver package in Ubuntu:

Bug description:
  I tried to record sound with my internal Mic. Nothing is working. I
  use arecord.

  bagus:~$ arecord test.wav
  arecord: main:834: audio open error: Operation not supported
  bagus:~$ arecord -d 10 -f cd -t wav -D copy foobar.wav
  ALSA lib pcm.c:2675:(snd_pcm_open_noupdate) Unknown PCM copy
  arecord: main:834: audio open error: No such file or directory

  bagus:~$ arecord -l
  **** List of CAPTURE Hardware Devices ****
  card 0: sofhdadsp [sof-hda-dsp], device 0: HDA Analog (*) []
    Subdevices: 1/1
    Subdevice #0: subdevice #0
  card 0: sofhdadsp [sof-hda-dsp], device 6: DMIC (*) []
    Subdevices: 1/1
    Subdevice #0: subdevice #0
  card 0: sofhdadsp [sof-hda-dsp], device 7: DMIC16kHz (*) []
    Subdevices: 1/1
    Subdevice #0: subdevice #0

  bagus:~$ lsb_release -rd
  No LSB modules are available.
  Description:  Ubuntu Noble Numbat (development branch)
  Release:      24.04

  bagus:~$ apt-cache policy alsa-base
    Installed: (none)
    Candidate: 1.0.25+dfsg-0ubuntu7
    Version table:
       1.0.25+dfsg-0ubuntu7 500
          500 noble/main amd64 Packages


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