https://bugs.kde.org/show_bug.cgi?id=516974
Bug ID: 516974
Summary: Wayland: Display permanently lost after DP monitor
power cycle on NVIDIA 580 with HDR enabled (Plasma 6)
Classification: Plasma
Product: kwin
Version First 6.6.0
Reported In:
Platform: KDE Linux
OS: Linux
Status: REPORTED
Severity: normal
Priority: NOR
Component: wayland-generic
Assignee: [email protected]
Reporter: [email protected]
Target Milestone: ---
System:
- GPU: NVIDIA GeForce RTX 4070
- Driver: 580.126.09 (proprietary)
- Kernel: 6.17.0-14-generic
- Plasma: 6.x (KDE Neon 24.04)
- Session: Wayland
- Connection: DisplayPort
- HDR enabled
Issue:
When the DisplayPort monitor is powered off and then powered back on (either
manually or via monitor sleep), the display does not recover.
The session remains active (SSH access works), but the display stays black
permanently.
Restarting SDDM restores the login screen, but restarting only KWin via:
systemctl --user restart plasma-kwin_wayland.service
results in complete loss of display output and does not recover.
Only terminating the entire user session or rebooting restores functionality.
Important comparison:
The issue does NOT occur under Plasma (X11). X11 recovers correctly after
monitor power cycle.
Reproduction Steps:
1. Log into Plasma Wayland.
2. Ensure HDR is enabled.
3. Power off monitor (or allow monitor sleep).
4. Power monitor back on.
5. Display remains black permanently.
Expected Result:
Display should reattach and session should recover automatically.
Actual Result:
Display is permanently lost until session is terminated.
Notes:
This appears to be a DRM hotplug / connector re-acquisition failure under
Wayland with NVIDIA proprietary driver.
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