Hardware pre-flight check
Answer a few questions about your system. Each result cites a source, and where official docs state no anti-cheat-specific requirement the result says so rather than guessing.
Anti-cheat type Note
Look the game up on the tracker first. Its status says whether the developer enabled Linux support.
GPU driver Note
Run vulkaninfo --summary. If it lists no GPU, Proton's Direct3D translation cannot work.
DXVK driver support wiki: it lists the minimum driver versions, which we do not copy hereDisplay session Note
Valve's docs and the sources we track state no anti-cheat requirement for Wayland versus X11. If one game fails only in one session, report it with the log.
Kernel version Note
Enter the output of uname -r to check it.
vm.max_map_count Note
Enter the output of sysctl vm.max_map_count to check it.