This audio issue was resolved for me with the SoC updates included in stable linux-image:
  5.10.0-21-amd64 5.10.162-1 (2023-01-21) x86_64

For reference, my machine info:
  Product Name: 20QDCTO1WW
  Version: ThinkPad X1 Carbon 7th
  BIOS Version: N2HET68W (1.51)
  Audio PCI info:
00:1f.3 Audio device [0403]: Intel Corporation Cannon Point-LP High Definition Audio Controller [8086:9dc8] (rev 11) (prog-if 80)

Thanks for this bug report, the build info and revert patch for -20, and for rolling in the additional SoC bits to make -21 work properly.

Kind regards,
Michael

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