[Discover] [Bug 523938] New: [KWin Wayland + NVIDIA 580] Screen flickering on Plasma login screen and in specific Qt/XWayland apps (e.g. Nekoray) prior to user interaction

https://bugs.kde.org/show_bug.cgi?id=523938

            Bug ID: 523938
           Summary: [KWin Wayland + NVIDIA 580] Screen flickering on
                    Plasma login screen and in specific Qt/XWayland apps
                    (e.g. Nekoray) prior to user interaction
    Classification: Applications
           Product: Discover
      Version First 6.7.3
       Reported In:
          Platform: Fedora RPMs
                OS: Linux
            Status: REPORTED
          Severity: normal
          Priority: NOR
         Component: KDE Linux backend
          Assignee: [email protected]
          Reporter: [email protected]
                CC: [email protected]
  Target Milestone: ---

[Wayland + NVIDIA] Login screen flickers until first mouse interaction; similar
flicker in some apps (e.g. Nekoray)

Description:
I am reporting a persistent flickering / frame-pacing issue on Fedora 44 KDE
Plasma with NVIDIA drivers on Wayland.

Environment:
- OS: Fedora 44 KDE Plasma
- Kernel: 7.1.6-201.fc44.x86_64 (issue was also reproduced on 7.1.4-202)
- Desktop: KDE Plasma 6 on Wayland
- GPU: NVIDIA
- NVIDIA driver: 580.173.02
- nvidia-drm.modeset=1 is enabled

Symptoms:
1. The login screen (SDDM / Plasma login) flickers visibly after boot.
2. The flickering continues until I move/click the mouse for the first time.
3. After the first pointer interaction, the login screen stabilizes.
4. Similar flickering also appears in some applications such as Nekoray.

What I already tried:
- Verified the system is now stable on the newer kernel.
- Reinstalled and rebuilt kernel module dependencies.
- Rebuilt initramfs with dracut.
- Rebuilt NVIDIA modules with akmods --force.
- Confirmed NVIDIA DRM modeset is enabled.

Result:
The system is otherwise stable; networking and audio work correctly. The issue
seems specific to Plasma Wayland/KWin rendering behavior with NVIDIA, affecting
the login screen and some apps.

-- 
You are receiving this mail because:
You are watching all bug changes.