https://bugs.kde.org/show_bug.cgi?id=511793
--- Comment #6 from [email protected] --- (In reply to william.drumright from comment #4) > 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. Where are you adding `KWIN_DRM_NO_DIRECT_SCANOUT=1` to? -- You are receiving this mail because: You are watching all bug changes.
