Bug 504541 - Bad bold font rendering
Summary: Bad bold font rendering
Status: RESOLVED UPSTREAM
Alias: None
Product: kde
Classification: I don't know
Component: general (other bugs)
Version First Reported In: unspecified
Platform: Arch Linux Linux
: NOR normal
Target Milestone: ---
Assignee: Unassigned bugs mailing-list
URL:
Keywords:
: 483334 (view as bug list)
Depends on:
Blocks:
 
Reported: 2025-05-19 18:05 UTC by Lalit Shankar Chowdhury
Modified: 2025-05-22 05:51 UTC (History)
4 users (show)

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

Attachments
Observed (172.91 KB, image/png)
2025-05-19 18:05 UTC, Lalit Shankar Chowdhury 		Details
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Description Lalit Shankar Chowdhury 2025-05-19 18:05:01 UTC 
Created attachment 181532 [details]
Observed

SUMMARY

Bad font rendering for bold fonts.

STEPS TO REPRODUCE
1. Change UI font to Adwaita Sans/Inter
2. Hover over the clock widget

OBSERVED RESULT

The correct bold version of the font is not picked. Instead, it's artifically bolded which makes the bold text look bad. (Attached screenshot)

EXPECTED RESULT

Bold font is rendered properly in About page of settings.

SOFTWARE/OS VERSIONS
Linux/KDE Plasma: 6.14.6-2-cachyos
KDE Plasma Version: 6.3.5
KDE Frameworks Version: 6.14.0
Qt Version: 6.9.0
Comment 1 Nate Graham 2025-05-19 18:49:25 UTC 
We're just using the standard "make it bold" code, which means this is an issue with either Qt itself, or the fontconfig  setup on the machine.

I have a vague memory of a Qt bug report about this a year or so ago, but I can't find it now.

In the meantime, talking with your distro folks about the fontconfig they ship may be useful.
Comment 2 Nate Graham 2025-05-19 19:22:23 UTC 
I've found various Qt issues about bad bold font rendering, especially with non-default fonts. See:
- https://bugreports.qt.io/browse/QTBUG-131574
- https://bugreports.qt.io/browse/QTBUG-46042
- https://bugreports.qt.io/browse/QTBUG-63792

If it's not one of these, it's probably something similar.
Comment 3 John Kizer 2025-05-22 05:51:56 UTC 
*** Bug 483334 has been marked as a duplicate of this bug. ***