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

[Andy Chi]

Hi @Dan,
Audio doesn't work on the platform since lack of SRU LP#1924970, I locally build a workable alsa-ucm-conf and systemd to test mic mute key on groovy for the platform. Also it needs oem kernel to support Dell Privacy. Since audio is not supported on groovy, could we pass it? Can we proceed for focal first?

Thanks.

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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:
  In Progress
Status in systemd source package in Groovy:
  In Progress
Status in systemd source package in Hirsute:
  In Progress

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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