I'm having the same bug with Proton 3.16-4 and mesa 18.2.2. I'm not sure if I didn't have it before, or if I just didn't notice. It only happens when the mouse is moving very slowly.
I have the same mouse issues with DUSK as described in this bug report for Deus Ex: The Fall: #590 >If I aim to the left or up it moves in other directions. >This is only during usually game-play. But otherwise the mouse...
I can't get sound to work on Dusk. Everything else about it is working flawlessly. I don't know if it's a graphics driver issue, but I see you are on Mesa 18.1.6. I'm using the bleeding edge Padoka one recommended by Val...