This bug was fixed in the package linux-oem-5.13 - 5.13.0-1017.21

---------------
linux-oem-5.13 (5.13.0-1017.21) focal; urgency=medium

  * focal/linux-oem-5.13: 5.13.0-1017.21 -proposed tracker (LP:
#1946722)

  * Intel AX201 8086:7af0 subsys 8086:4070 hardware reset periodically: FW error
    in SYNC CMD UNKNOWN (LP: #1941665)
    - iwlwifi: mvm: support BIOS enable/disable for 11ax in Russia
    - iwlwifi: mvm: Read acpi dsm to get unii4 enable/disable bitmap.

 -- Timo Aaltonen <timo.aalto...@canonical.com>  Tue, 12 Oct 2021
11:54:40 +0300

** Changed in: linux-oem-5.13 (Ubuntu Focal)
       Status: Confirmed => Fix Released

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https://bugs.launchpad.net/bugs/1946383

Title:
  Fix missing recording from headset mic

Status in HWE Next:
  New
Status in linux-oem-5.13 package in Ubuntu:
  Invalid
Status in linux-oem-5.14 package in Ubuntu:
  Invalid
Status in linux-oem-5.13 source package in Focal:
  Fix Released
Status in linux-oem-5.14 source package in Focal:
  Confirmed

Bug description:
  [Impact] 
  When using headset mic to record, the beginning of 2 seconds period is
  not recorded.

  [Fix]
  Skip shutup routines for the codec. The shutup routines somehow
  interferes headset mic recording.

  [Test]
  External headset mic no longer records blank period once the patch is
  applied.

  [Where problems could occur]
  Shutup routines are mainly for outputs like headphone and speakers.
  Since the patch is using a rather generic match for both ALC236 and
  ALC256, many systems might start to observe pop sound from the audio
  outputs.

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