Pageflip timed out when adjusting brightness on KDE Plasma Wayland (driver 610.43.02)

System Info

• OS: CachyOS (Arch-based), Kernel 7.0.12-1-cachyos
• DE: KDE Plasma 6.7.0, KWin 6.7.0 (Wayland)
• Driver: NVIDIA 610.43.02
• GPU: NVIDIA GeForce RTX 4060 Laptop GPU (AD107M), PCI 01:00.0
• Laptop: ASUS TUF Gaming F15 FX507VV
• CPU: Intel Core i7-13700H (Raptor Lake)

Monitors

• eDP-1: BOE NE156QHM-NY1, 2560×1440@165Hz (built-in)
• HDMI-A-1: SKG H24F8, 1920×1080@180Hz (external)

Description

Adjusting display brightness via KDE's "Brightness and Color" system tray applet causes the primary display to freeze. The error kwin_wayland_drm: Pageflip timed out! appears in journalctl. This also triggers when adjusting Night Light temperature.

Steps to Reproduce

1. Connect external monitor via HDMI (different refresh rate than built-in)
2. Log into KDE Plasma Wayland session
3. Open "Brightness and Color" from system tray
4. Drag the brightness slider
5. Primary display freezes immediately

Workaround

• Switch TTY (Ctrl+F2 then Ctrl+F1) to recover
• Disable Night Light in KDE settings

Related

• KDE Bug #503870 - marked RESOLVED UPSTREAM, fix was in 575.51.02 / 580.76.05
• This appears to be a regression in 610.43.02

Additional Notes

• Multi-monitor with mismatched refresh rates (165Hz + 180Hz) seems to be a key factor
• Disabling Night Light reduces occurrence but does not fully prevent the freeze
• Hyprland (same hardware) does not exhibit this issue

Reproduce the freeze with the listed KDE Plasma Wayland, dual-monitor, mismatched-refresh-rate setup and inspect journalctl for the kwin_wayland_drm pageflip timeout. Compare the behavior across the reported NVIDIA driver versions and review KDE Bug #503870. Done means establishing whether this is a driver regression and documenting an actionable fix or upstream diagnosis.