Problem

On Ubuntu 25.10 (Wayland), OpenCode freezes when moving the window between monitors with different refresh rates (60Hz + 165Hz). The process stays alive; the UI becomes unresponsive and must be killed. This happens even with the terminal panel closed.

Environment

• Ubuntu 25.10, GNOME/Mutter (Wayland)
• Dual monitors: 60Hz + 165Hz
• NVIDIA RTX 4060 (driver 590.48.01 open)

Repro

1. Start OpenCode on a Wayland session.
2. The app forces X11/XWayland (GDK_BACKEND=x11 / WINIT_UNIX_BACKEND=x11).
3. Move the window between monitors while windowed.
4. UI freezes (process still alive).

Evidence

• Debug logs show Rust + UI heartbeats continue during the freeze.
• gnome-shell logs: "Frame has assigned frame counter but no frame drawn time" at the freeze time.
• No kernel NVRM/Xid, segfault, or coredump entries.

Workaround (Confirmed)

Run native Wayland (do not force X11):

OC_ALLOW_WAYLAND=1 env -u GDK_BACKEND -u WINIT_UNIX_BACKEND -u WEBKIT_DISABLE_DMABUF_RENDERER -u WEBKIT_DISABLE_COMPOSITING_MODE bun run tauri dev

Proposed Fix

• On Linux, avoid forcing X11 by default (or auto-detect mixed refresh rate setups and prefer native Wayland).
• Suggestion: add a Settings toggle to switch between Native Wayland and X11 fallback. The toggle would set/unset these env vars on Linux:
  • GDK_BACKEND
  • WINIT_UNIX_BACKEND
  • WEBKIT_DISABLE_DMABUF_RENDERER
  • WEBKIT_DISABLE_COMPOSITING_MODE