https://bugs.kde.org/show_bug.cgi?id=511793
[email protected] changed: What |Removed |Added ---------------------------------------------------------------------------- CC| |[email protected] --- Comment #4 from [email protected] --- On KDE Plasma Wayland (KWin 6.5.4) with AMD GPU, games that grab/release the mouse cursor (e.g. World of Warcraft WOTLK / Classic) show severe frametime stalls when right-clicking to control the camera. This does not occur on NVIDIA hardware. Environment (affected system) OS: Archy KDE Plasma: 6.5.4 Session: Wayland GPU: AMD RX 7900 XTX Driver: amdgpu + Mesa Monitor: 165 Hz Mouse: 1000 Hz polling Game runtime: Wine / Proton GE (DXVK) Game: World of Warcraft WOTLK (legacy client) Symptoms Right-clicking to rotate camera causes a visible hitch / microstutter MangoHud FPS briefly drops to 0 exactly when the mouse button is pressed or released What fixes the issue KWIN_DRM_NO_DIRECT_SCANOUT=1 → Completely resolves the stutter and FPS→0 drops Gamescope → Also resolves it, but causes alt-tab issues and occasional mouse/camera desync Partial workaround Disabling in-game hardware cursor (adds mouse latency) Control test (no issue) Tested on a laptop with NVIDIA GPU using the same game and runtime: CPU: Intel i7 (12th gen) GPU: RTX 3070 Ti OS: Archy Session: KDE Wayland Mouse: 1000 Hz polling Same Wine/Proton GE runner → No stutter, no FPS drops, no Gamescope or env vars needed Likely cause Appears related to KWin Direct Scanout being invalidated by cursor visibility / pointer grab changes, causing a brief present stall. Disabling Direct Scanout globally avoids the issue. -- You are receiving this mail because: You are watching all bug changes.
