[Bug 1926547] Re: Add Dell Privacy Mic Mute Key mapping

[Andy Chi]

Test with machine which supports Dell privacy. Mic mute key works well
in groovy and focal.

[kernel version]
linux-oem-20.04b (1029)

** Tags removed: verification-needed-focal verification-needed-groovy
** Tags added: verification-done-focal verification-done-groovy

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Title:
  Add Dell Privacy Mic Mute Key mapping

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