Bug 501375 - Chrome shows a line between chrome and content when using Wayland and 150% scale
Summary: Chrome shows a line between chrome and content when using Wayland and 150% scale
Status: RESOLVED DOWNSTREAM
Alias: None
Product: kwin
Classification: Plasma
Component: wayland-generic (other bugs)
Version First Reported In: 6.3.2
Platform: Gentoo Packages Linux
: NOR minor
Target Milestone: ---
Assignee: KWin default assignee
URL: https://issues.chromium.org/issues/40...
Keywords: wayland-only
Depends on:
Blocks:
 
Reported: 2025-03-11 21:01 UTC by Andrew Udvare
Modified: 2025-03-26 17:59 UTC (History)
2 users (show)

See Also:
Latest Commit:
Version Fixed/Implemented In:
Sentry Crash Report:

Attachments
Screenshot showing behaviour (135.48 KB, image/png)
2025-03-11 21:01 UTC, Andrew Udvare 		Details
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Description Andrew Udvare 2025-03-11 21:01:15 UTC 
Created attachment 179317 [details]
Screenshot showing behaviour

SUMMARY
An ugly transparent line shows between the chrome (top bar) and the content in Chrome only when Ozone platform hint is set to Auto or Wayland and only when using scale of 150%.

STEPS TO REPRODUCE
1. Run Chrome Beta 135.0.7049.3 or better
2. Set Ozone platform hint to 'Auto' or 'Wayland' in chrome://flags/#ozone-platform-hint
3. Restart Chrome.

OBSERVED RESULT
Transparent line shows.

EXPECTED RESULT
Transparent line should not show.

SOFTWARE/OS VERSIONS
Operating System: Gentoo Linux 1
KDE Plasma Version: 6.3.2
KDE Frameworks Version: 6.11.0
Qt Version: 6.8.2
Kernel Version: 6.13.6-gentoo-limelight (64-bit)
Graphics Platform: Wayland
Processors: 16 × 11th Gen Intel® Core™ i9-11900K @ 3.50GHz
Memory: 62.7 GiB of RAM
Graphics Processor: NVIDIA GeForce RTX 4090

ADDITIONAL INFORMATION
Started after update to 6.3.2. Chrome was likely updated but since it only happens with 150% scale I think it is KDE's bug.

Workaround for now is to set Ozone platform hint to Default which makes it use XWayland.
Comment 1 Andrew Udvare 2025-03-12 05:30:43 UTC 
I have been able to reproduce this on another machine with the same packages installed. It is a laptop with a 4K display I normally run at 175% scale but with 150% scale set the same thing happens.
Comment 2 Andrew Udvare 2025-03-12 23:59:17 UTC 
Upgraded to 6.3.3 and there is no difference.
Comment 3 John Kizer 2025-03-26 17:59:46 UTC 
Hi - this has been reported as a Chromium bug: https://issues.chromium.org/issues/40900734

Thanks!