This bug is missing log files that will aid in diagnosing the problem.
While running an Ubuntu kernel (not a mainline or third-party kernel)
please enter the following command in a terminal window:

apport-collect 1982716

and then change the status of the bug to 'Confirmed'.

If, due to the nature of the issue you have encountered, you are unable
to run this command, please add a comment stating that fact and change
the bug status to 'Confirmed'.

This change has been made by an automated script, maintained by the
Ubuntu Kernel Team.

** Changed in: linux (Ubuntu)
       Status: New => Incomplete

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https://bugs.launchpad.net/bugs/1982716

Title:
  Audio mute key (f5) LED and Mic mute key (f8) LED are no function on
  HP 440/450/640/650 G9

Status in OEM Priority Project:
  New
Status in linux package in Ubuntu:
  Incomplete

Bug description:
  [Impact]
  The audio mute key (F5) and mic-mute LED (F8) don't work on some HP 
440/450/640/650 G9 laptops.

  [Fix]
  The HP ProBook 440/450 G9 and EliteBook 640/650 G9 have multiple
  motherboard design and they are using different subsystem ID of audio
  codec. Add the same quirk for other MBs.

  [Test]
  After applying the fix, the mute LEDs are working.

  [Where problems could occur]
  It's low risk as it's specific ID for HP new machines. If the HP ships other 
machines using same SSID, then the LED may not work on those machines.

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