Japanese Input Not Working in Street Fighter 6 (Proton) — Fixed by IME Variables in /etc/environment
Correction (2026-08-08) The original conclusion of this article — “this cannot be resolved through user configuration” — was wrong. Setting IME environment variables in /etc/environment made Ctrl+Space work for direct input. If you only want the fix, jump to Update: Solved. The investigation below is kept as-is, as a record of how I reasoned my way to the wrong conclusion. Symptom Pressing Ctrl+Space (the fcitx5 trigger key) in Street Fighter 6’s chat box does not switch to Japanese input (Mozc). Text stays in romaji and nothing responds. ...