SubMiner/changes/x11-backend-keeps-mpv-renderer.md

type: fixed area: playback

• XWayland/X11 mode (--backend=x11, or the automatic fallback on non-Hyprland/Sway Wayland sessions) no longer forces mpv onto --vo=gpu --gpu-api=opengl. It now only pins the window context (--gpu-context=x11vk,x11egl,x11), so a vo=gpu-next config keeps its renderer, API, and user shaders. Forcing the legacy OpenGL renderer crashed mpv on the first fullscreen toggle for anyone using a gpu-next user shader that emits a 4-component LUMA hook (ArtCNN and friends), which asserts in mpv's old renderer (copy_image: *offset + count < sizeof(dst)) as soon as the shader's upscale-only condition turns on.