On my Debian system, VLC 2.2.1 is responding to my laptop's volume keys, and also forwarding them to the system, so when VLC is open the keys adjust both volumes simultaneously. Basically, I'm seeing the same issue as described here: How do I stop VLC from stealing my volume buttons , except on Debian.
Frustratingly, an answer to that question states a preference was added to control this in 1.1.7. In 2.2.1, this preference "Ignore keyboard volume buttons" is nowhere to be found.
I discovered in the 'Hotkeys' section that volume up/volume down were both listing two hotkeys, (Ctrl+Up=Volume Up is what was listed for volume up), but unsetting these and just setting to the Ctrl-arrow combos has no impact on the behavior.
Is this now located somewhere else, or is there another way to adjust this?