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  • Look no further as this question has already been answered: superuser.com/questions/248517/show-keys-pressed-in-linux Commented Jul 2, 2020 at 6:58
  • See this answer for driver level. layers. Once you have an X event, applications grab the keyboard. See here how to debug this. The first candidate for Volume control keys etc. is your window manager (also as part of the Desktop environment). Commented Jul 2, 2020 at 13:37
  • Promising solutions ! Thank you for your answers @dirkt and Artem S. Tashkinov. Commented Jul 4, 2020 at 14:25