After adding impish-proposed to /etc/apt/source.list and updating the
systemd to 248.3-1 ubunutu8.1, GUI still doesn't pop up "Mic Mute" icon.

dmesg:

Unknown key with type 0x0012 and code 0x000e pressed

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https://bugs.launchpad.net/bugs/1926547

Title:
  Add Dell Privacy Mic Mute Key mapping

Status in OEM Priority Project:
  Fix Released
Status in OEM Priority Project focal series:
  Fix Released
Status in systemd package in Ubuntu:
  Fix Released
Status in systemd source package in Focal:
  Fix Released
Status in systemd source package in Groovy:
  Fix Released
Status in systemd source package in Hirsute:
  Fix Released
Status in systemd source package in Impish:
  Fix Committed

Bug description:
  [Impact]

   * Dell introduces new function called Dell Privacy, it utilizes
  hardware mute to control audio and camera. The commit map the reported
  key event to mic mute for making userspace can work as before, "Mic
  Mute" dialog pop-up while the mic mute button is pressed.

  [Test Plan]

   * Use a Dell machine, which has Dell privacy function, and press mic mute 
key.
     GUI will pop up "Mic Mute" icon.

  [Where problems could occur]

   * This change adds key event mapping in hwdb, which won't impact
  other hardware.

   any regression would likely cause problems with key(s) from the
  specific dell kb matching the modified listing in the hw db.

  [Other Info]

   * The change can only work with kernel commit on some specific hardware, ex. 
Latitude 9520. The commit series is 
"hardware-privacy-implementation-for-dell-laptop" in alsa-devel kernel tree.
     https://patchwork.kernel.org/project/alsa-devel/list/?series=465445
   * This change has been verified on Dell machine.

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