HP ZBook Power G8, Keyboard issues on Linux

[Massimo B.]

I have several issues with the keyboard on a HP ZBook Power G8 and no idea how to solve that:

When NUM pad is enabled, the arrow keys are not working anymore, up down left right are all sending display DIM low.

fn+F8 for Mic mute does not work.

I can't use the Print button for screenshots. Applying a button for screenshots in Xfce, I press the Print button and it's detected as Print button. But when using it, it is only lowering the display brightness and not starting a screenshot. The shortcut for CTRL+Print works.
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HP ZBook Power 15.6" G8 i7-11800H|HP EliteDesk 800G1 i7-4790|HP Compaq Pro 6300 i7-3770