Thanks for the reply
The laptop has 3 buttons (turn down, mute and turn up). On Mint none of those works, while on windows it's possible to at least mute it. Anyway, on both systems if I try to turn the sound down it goes up immediately. A temporary solution I guess would be to get rid of system sounds so they don't scare anyone to their death all of the sudden, but then there's still the volume meter popup that is on top of all windows. Is there a way to get rid of that one?
I'll try to find maybe some info specific for the model to see if the problem is known.