HP Elitebook 840 G1 - 19.10 - Microphone mute key does not work

[Simple Machine]

I just installed Ubuntu 19.10 on my HP Elitebook 840 G1. Switching from Windows to Ubuntu for personal use.

The mic does not enable/disable with FN+F8 combo and the light is constantly on.

I found the following solution to my problem. However, I do not know how to implement it in Ubuntu 19.10 (new to Ubuntu and generally not as techinical).
https://wiki.archlinux.org/index.php/HP_EliteBook_840_G1#Enable_the_microphone_muting_key

1. Would greatly appreciate if someone could point me to step by step instructions to install the code from the link above. I can report back if this resolve the issue.
2. Also, is there a way to incorporate a fix for this issue with HP laptops in Ubuntu going forward? When I was searching for a fix, I found this to be a widespread issue with various HP laptops and Ubuntu dating back a couple years.

Many thanks.

[Balint Reczey (rbalint)]

Thank you for the bug report. We regularly backport fixes of systemd for bugs affecting a broad set of users, but this particular problem affect only users of this specific laptop model.

Could you please report the problem at systemd upstream to automatically get Ubuntu fixed, too, when packaging the first fixed upstream release?

There is already a similar problem reported against an other HP EliteBook model:
https://github.com/systemd/systemd/issues/13463

[Simple Machine (thesimplemachine)]

@rbalint I updated the laptop to Ubuntu 20.04. The mic still does not enable/disable with FN+F8 combo and the light is constantly on. I haven't been able to implement in the following link (due to lack of technical know how):
https://wiki.archlinux.org/index.php/HP_EliteBook_840_G1#Enable_the_microphone_muting_key

However, the auto screen rotation issue appears to have been fixed in 20.04 as detailed in the link you posted.
https://github.com/systemd/systemd/issues/13463

[Simple Machine (thesimplemachine)]

Forgot to mention that when I run "sudo showkey -s" in terminal to test the output for the Fn+F8 combination I do not see any output.

Other key press combinations show outputs. For example pressing Fn+F7 shows "0xe0 0x30 0xe0 0xb0"

[Simple Machine (thesimplemachine)]

While this is a bug. It is also a question on how to implement the potential fix identified.

[Simple Machine (thesimplemachine)]

Please note that I received help in translating the archlinux code. The site below lists out the solution for anyone else trying to resolve this problem on their laptop.

https://github.com/systemd/systemd/issues/15774

[Po-Hsu Lin (cypressyew)]

https://github.com/systemd/systemd/commit/b0eb3d6ed2ab3a7920e7139d62b04a88b2fa6382
This fix has been merged.

I will close this bug, thanks!