Added fallbacks for fsync issues on CachyOS.

ptlinux/ui.py

@@ -1371,6 +1371,7 @@ def run_dashboard(paths: AppPaths) -> None:
 		scaler_value = tk.StringVar(value=current_settings.scaler)
 		filter_value = tk.StringVar(value=current_settings.filter)
 		runtime_value = tk.StringVar(value=current_settings.runtime)
+		proton_sync_value = tk.StringVar(value=current_settings.proton_sync)
 		proton_path_value = tk.StringVar(value=current_settings.proton_path or "")
 		game_source_value = tk.StringVar(value=current_settings.game_source or "")
 
@@ -1511,6 +1512,7 @@ def run_dashboard(paths: AppPaths) -> None:
 					scaler=scaler_value.get(),
 					filter=filter_value.get(),
 					runtime=runtime_value.get(),
+					proton_sync=proton_sync_value.get(),
 					proton_path=proton_path_value.get().strip() or None,
 					game_source=game_source_value.get().strip() or None,
 				)
@@ -1637,6 +1639,14 @@ def run_dashboard(paths: AppPaths) -> None:
 			runtime_value,
 			("auto", "proton7", "umu"),
 		)
+		add_choice(
+			rendering_card,
+			8,
+			"Proton synchronization",
+			"Auto uses esync on CachyOS",
+			proton_sync_value,
+			("auto", "fsync", "esync"),
+		)
 
 		overrides_card = ttk.LabelFrame(
 			content,