[Bug 1738153] Re: need backport the new scancode of dell-wmi for Microphone mute hotkey to xenial

[Dimitri John Ledkov]

@racb
unknown is a placeholder, which is now assigned to wlan. Without unknown, there would be debugging error kernel messages `unknown key pressed`. So previously we knew the physical key exists and is pressable, but dind't know what it should do, but now we do know what it does.

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Title:
  need backport the new scancode of dell-wmi for Microphone mute hotkey
  to xenial

Status in OEM Priority Project:
  Confirmed
Status in OEM Priority Project xenial series:
  Confirmed
Status in systemd package in Ubuntu:
  Fix Released
Status in systemd source package in Xenial:
  Fix Committed
Status in systemd source package in Artful:
  Won't Fix

Bug description:
  [Impact]
  dell-wmi expend the scan code of Microphone mute hotkey from 0x150 to 0x100150, so need to add a new mapping for it.

  related commit:
  https://github.com/systemd/systemd/pull/5012

  [Test Case]
  1. install the udev package which applied patch.
  2. check if Microphone mute hotkey works.
  3. if it not works, please provide the log of evtest.

  [Regression Potential]
  low regression potential, because it just add one more mapping.

  also affect:
  LP: #1736352
  LP: #1740080
  LP: #1734609

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