https://bugs.kde.org/show_bug.cgi?id=474816
Bug ID: 474816
Summary: GLFW KWin Wayland limiting FPS to monitor refresh rate
Classification: Plasma
Product: kwin
Version: 5.27.8
Platform: unspecified
OS: All
Status: REPORTED
Severity: wishlist
Priority: NOR
Component: compositing
Assignee: kwin-bugs-n...@kde.org
Reporter: r.zotschan...@gmail.com
Target Milestone: ---
Hello! I'm the member of Vulkan Mod (by xCollateral) for Minecraft Java Edition
development team. We worked on implementing native Wayland support for
Minecraft.
Minecraft Java Edition uses GLFW library for creating windows, and this works
perfectly. However, Kwin is the only one Wayland compositor that limiting FPS
to monitor refresh rate with RenderFrameQueue 2. There a way to unlock FPS by
setting RenderFrameQueue higher than 2, however, this causes game instance to
race with compositor causing flickering/tearing/twitching visual artifacts, so
RenderFrameQueue 2 is the way to go on Wayland.
Testing showed that Wayland compositors like Mutter, Hyprland, Sway is not
limiting FPS while working as intended with RFQ 2 and the KWin is only Wayland
compositor that limits FPS to monitor refresh rate with RFQ set to 2.
Is this behaviour intended? Will it change with Plasma 6?
In addition first person shooter XONOTIC repeats absolute same behavior with
GLX mode only on KDE Plasma.
KDE Plasma known as ultimate DE for gaming, and this behaviour is drawback for
native Wayland gaming.
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