Bug 491258

Summary: Atrocious font rendering when using fractional scaling
Product: [Plasma] plasmashell Reporter: Ilia Kats <ilia-kats>
Component: Task Manager and Icons-Only Task ManagerAssignee: Plasma Bugs List <plasma-bugs>
Status: RESOLVED DUPLICATE    
Severity: normal CC: cwo.kde, qydwhotmail
Priority: NOR    
Version: 6.1.3   
Target Milestone: 1.0   
Platform: Arch Linux   
OS: Linux   
Latest Commit: Version Fixed In:
Sentry Crash Report:
Attachments: screenshot
screenshot
screenshot systemsettings
screenshot systemsettings
screenshot systemsettings

Description Ilia Kats 2024-08-04 16:59:46 UTC
Created attachment 172269 [details]
screenshot

I have global scaling set to 130 % on a 4K display on Wayland. As shown in the attached screenshot, a particular task (third from the left) in the text-and-icons task manager has really bad font rendering. It affects this position specifically, if I switch KWrite with Firefox then the KWrite task will be rendered badly. If I open enough applications to cause the tasks to shring in width, the issue disappears.

Please bring back the "force font DPI" option.
Comment 1 Ilia Kats 2024-08-04 18:59:32 UTC
Created attachment 172277 [details]
screenshot

Same issue in System Monitor. I guess it's a general thing with QML? I'm using Noto Sans 10 pt with RGB subpixel rendering and Hinting set to Slight.
Comment 2 Ilia Kats 2024-08-04 19:14:34 UTC
Created attachment 172279 [details]
screenshot systemsettings

Also in systemsettings, but only on some pages
Comment 3 Ilia Kats 2024-08-04 19:14:50 UTC
Created attachment 172280 [details]
screenshot systemsettings
Comment 4 Ilia Kats 2024-08-04 19:15:31 UTC
Created attachment 172281 [details]
screenshot systemsettings
Comment 5 cwo 2024-08-04 23:38:06 UTC
It's a known issue that can happen with current versions of Qt in some cases... you seem to be heavily affected.

There's workarounds in the linked bug report.

*** This bug has been marked as a duplicate of bug 479891 ***