Helldivers II & Timberborn refusing input and getting stuck.

[ThorinWolf]

Compatibility Report

• Name of the game with compatibility issues: Helldivers II, Timberborn, likely more.
• Steam AppID of the game: 553850, 1062090 (no logs provided)

System Information

• GPU: NVIDIA GTX 1660 SUPER
• Video driver version: nvidia 550.78
• Kernel version: 6.8.9-zen1-2-zen
• Link to full system information report as Gist: https://gist.github.com/ThorinWolf/5c65a9bc0171cafc7e6e950b8ef1c6f2
• Proton version: Experimental, 9.0-1, GE-Proton8-11, GE-Proton9-4, likely more.

I confirm:

• [X] that I haven't found an existing compatibility report for this game.
• [X] that I have checked whether there are updates for my system available.

Symptoms

Movement gets stuck in one direction for a time, refusing all keyboard inputs. Tabbing to another window still allows me to type, and stops the movement, but still refuses input. It still accepts mouse input and nothing else. When it become unstuck, all attempted key presses execute in sequence (like a buffer) - if keys were only pressed, it will be rapid; if they were held down, it becomes stuck again until the time held has passed and buffer is empty. This makes Helldivers II unplayable, though it's not as egregious when it occurs for Timberborn as it doesn't necessitate constant keyboard input. Video attached to show what occurs during this time.

Reproduction

Simply move around using movement. Not limited to WASD, have tested with TFGH also. Occurs at random. Seems to happen more if I limit frame rate using mangohud to 30fps. Using gamemoderun in order to double performance.

steam-553850.log

https://github.com/ValveSoftware/Proton/assets/59799077/fb707707-701b-4cbd-8975-7b1883b26312