Bug 515266 - New plasma releases break secondary display color for some apps
Summary: New plasma releases break secondary display color for some apps
Status: RESOLVED DUPLICATE of bug 514868
Alias: None
Product: kwin
Classification: Plasma
Component: colour-management (other bugs)
Version First Reported In: 6.5.5
Platform: Neon Linux
: NOR major
Target Milestone: ---
Assignee: KWin default assignee
URL:
Keywords:
Depends on:
Blocks:
 
Reported: 2026-01-29 15:42 UTC by Thomas Makin
Modified: 2026-01-29 22:45 UTC (History)
1 user (show)

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Description Thomas Makin 2026-01-29 15:42:23 UTC 
After updating to Plasma 6.5.5 (tested on KDE Neon 24.04 and Fedora 43), an issue crops up where if I launch a chrome-based browser (maybe other XWayland apps too?) on my laptop screen and then drag them to a secondary monitor, they appear in what looks like 256 colors mode. Relaunching on ext screen fixes the issue. None of the displays support HDR.

99% sure this is KDE bug and not Chrome given it has been happening since the update. Definitely happened in last 2 weeks. Replicated on AMD and Intel platforms.

STEPS TO REPRODUCE
1.  Connect laptop to external display
2.  Launch a Chromium browser on internal display
3.  Drag to secondary screen

OBSERVED RESULT
Dragging some apps to ext screen drops color mode

EXPECTED RESULT
No change in color mode

SOFTWARE/OS VERSIONS
Linux/KDE Plasma:  KDE Neon 24.04, Fedora 43
KDE Plasma Version: 6.5.5 (from neon system)
KDE Frameworks Version: 6.22.0 (from neon system)
Qt Version: 6.10.1 (from neon system)
Comment 1 Thomas Makin 2026-01-29 17:51:34 UTC 
Aha! Appears to be an EDR issue-- disabling EDR on internal panel stops it from happening.
Comment 2 Zamundaaa 2026-01-29 22:45:25 UTC 

*** This bug has been marked as a duplicate of bug 514868 ***