System:
- GPU: NVIDIA GeForce RTX 5070 Ti (Blackwell)
- Driver: 595.71.05
- OS: CachyOS (Arch-based)
- Kernel: 7.0.1-1-cachyos
- Desktop: KDE Plasma 6.6.4 / KWin Wayland
- Display: 2560x1440 @ 240Hz via DisplayPort
Problem:
When HDR is enabled in KDE Display Settings, playing any fullscreen video
triggers a fatal KWin crash. The crash kills the Wayland session, disconnects
all running applications, and requires a hard reset in severe cases.
Journal errors at crash:
kwin_wayland: GL_INVALID_VALUE error generated. , and must be 1 or greater.
kwin_wayland: Invalid framebuffer status: “GL_FRAMEBUFFER_INCOMPLETE_ATTACHMENT”
kwin_wayland: Failed to create an offscreen framebuffer
kwin_wayland: atomic commit failed: Permission denied
kwin_wayland: Failed to open drm device /dev/dri/card0
Workaround:
Disabling HDR in KDE Display Settings completely stops the crashes.
This confirms the trigger is nvidia’s HDR output configuration path
being rejected by the driver, causing KWin’s framebuffer allocation to fail.
This is related to KDE bug #491751 which was marked resolved but is NOT
fixed for Blackwell GPUs on driver 595.x. The KDE developer (Zamundaaa)
confirmed this is a nvidia driver bug:
“GL_FRAMEBUFFER_INCOMPLETE_ATTACHMENT is just a dumb side effect of a
NVidia driver bug.”
Please fix HDR support on Blackwell architecture under KWin Wayland.