Bug 515122

Summary:	KWin Wayland 6.5.x sometimes initializes wrong color/sharpness on external monitor; fixed by kwin_wayland --replace
Product:	[Plasma] kwin	Reporter:	rxr <rajaroy495>
Component:	general	Assignee:	KWin default assignee <kwin-bugs-null>
Status:	REPORTED ---
Severity:	normal	CC:	kde, rajaroy495
Priority:	NOR
Version First Reported In:	6.5.5
Target Milestone:	---
Platform:	EndeavourOS
OS:	Linux
Latest Commit:		Version Fixed/Implemented In:
Sentry Crash Report:

Description rxr 2026-01-26 17:37:53 UTC

On Plasma 6.5.5 (Wayland), external monitors connected via DisplayPort sometimes initialize with incorrect color/sharpness after login.

Symptoms:
- Colors appear over-saturated / HDR-like
- Text looks extremely sharp or over-processed
- Gamma, brightness, and color settings have no effect
- Issue occurs non-deterministically (sometimes fixed after reboot)

Running:
  kwin_wayland --replace &

immediately fixes the issue without logging out, suggesting a KWin Wayland initialization bug in the color/scaling pipeline.

Environment:
- Plasma: 6.x
- KWin: 6.5.5
- Session: Wayland
- External monitor via DisplayPort
- Distribution: EndeavourOS (Arch-based)

The issue does not occur when using Plasma (X11).