Bug 502204

Summary: System Settings forces subpixel rendering even when configuration is set to greyscale
Product: [Applications] systemsettings Reporter: Peter <sunspark>
Component: kcm_fontsAssignee: Plasma Bugs List <plasma-bugs-null>
Status: RESOLVED DOWNSTREAM    
Severity: normal    
Priority: NOR    
Version First Reported In: 5.27.10   
Target Milestone: ---   
Platform: SteamOS   
OS: Linux   
Latest Commit: Version Fixed/Implemented In:
Sentry Crash Report:
Attachments: Screen clip from system settings showing that subpixel is active when it shouldn't be. Zoom in to see the colour fringing.

Description Peter 2025-03-30 16:06:15 UTC
Created attachment 179871 [details]
Screen clip from system settings showing that subpixel is active when it shouldn't be. Zoom in to see the colour fringing.

SUMMARY

Subpixel rendering is being forced even when rgba is set to none and lcdfilter is set to lcdnone.

STEPS TO REPRODUCE
1. Change sub-pixel rendering to none in fonts settings.

OBSERVED RESULT
Subpixel rendering is present in the system settings app across reboots.

EXPECTED RESULT
Greyscale, which is respected in other apps such as Dolphin.

SOFTWARE/OS VERSIONS
Operating System: SteamOS 3.6.22 Build: 20250224.1
KDE Plasma Version: 5.27.10
KDE Frameworks Version: 5.115.0
Qt Version: 5.15.12

ADDITIONAL INFORMATION
For other applications such as Dolphin, it IS using greyscale there. So it is the system settings app that insists on the usage of cleartype rendering.. for some reason.
Comment 1 Bug Janitor Service 2025-03-30 16:33:38 UTC
Thank you for the bug report!

However Plasma 5.27.10 is no longer eligible for support or maintenance from KDE; supported versions are 5.27. (LTS), and 6.3 (non-LTS) or newer. Please upgrade to a supported version as soon as your distribution makes it available to you. Plasma is a fast-moving project, and bugs in one version are often fixed in the next one.

If you need support for Plasma 5.27.10, please contact your distribution, who bears the responsibility of providing support for older releases that are no longer supported by KDE.

If you can reproduce the issue after upgrading to a supported version, feel free to re-open this bug report.