Hardware: hp6910p with Lubuntu 20.04 LTS.

This laptop has touch buttons for volume, wireless etc.

I assume they are controlled by ACPI.

Anyway, they all work wonderfully and exactly as intended after a fresh boot.

But after a Resume from Suspend or Hibernate they only work partially, and the "Mute" LED stays on constantly.

Something during the Suspend/Hibernate or the Resume operation goes wrong.

Q1: where do I find the ACPI configurations (not in the BIOS, I checked that).
Q2: how are they saved/restored during a Suspend/Resume?