under the following configuration the sound and microphone work as
described in
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1845678/comments/28

ii  libasound2:amd64                           1.1.9-0ubuntu1.3                 
      amd64        shared library for ALSA applications
ii  libasound2-data                            1.1.9-0ubuntu1.3                 
      all          Configuration files and profiles for ALSA drivers
ii  libasound2-plugins:amd64                   1.1.9-0ubuntu1                   
      amd64        ALSA library additional plugins
ii  linux-firmware                             1.183.5                          
      all          Firmware for Linux kernel drivers
ii  linux-image-5.3.0-46-generic               5.3.0-46.38                      
      amd64        Signed kernel image generic
ii  linux-image-generic                        5.3.0.45.38                      
      amd64        Generic Linux kernel image
ii  linux-modules-5.3.0-46-generic             5.3.0-46.38                      
      amd64        Linux kernel extra modules for version 5.3.0 on 64 bit x86 
SMP
ii  linux-modules-extra-5.3.0-46-generic       5.3.0-46.38                      
      amd64        Linux kernel extra modules for version 5.3.0 on 64 bit x86 
SMP

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https://bugs.launchpad.net/bugs/1845678

Title:
  Lenovo ThinkPad X1 Carbon 7th Generation built-in microphone doesn't
  work

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