https://bugs.kde.org/show_bug.cgi?id=482547
Bug ID: 482547
Summary: Improve parsing of distro custom fontconfig (Sub-pixel
RGB on Fedora KDE)
Classification: Applications
Product: systemsettings
Version: 5.27.11
Platform: Other
OS: Linux
Status: REPORTED
Keywords: reproducible
Severity: normal
Priority: NOR
Component: kcm_fonts
Assignee: plasma-b...@kde.org
Reporter: xalt7x.serv...@gmail.com
Target Milestone: ---
SUMMARY
Fedora by default has Sub-pixel RGB disabled by default (no symlink to
/usr/share/fontconfig/conf.avail/10-sub-pixel-rgb.conf in /etc/fonts/conf.d/) .
Instead, Fedora KDE spin ships special fontconfig which enables it
(https://pagure.io/fedora-kde/kde-settings/blob/f39/f/etc/fonts/conf.d/10-sub-pixel-rgb-for-kde.conf)
<match target="font">
<test name="desktop" compare="contains">
<string>KDE</string>
</test>
<edit name="rgba" mode="append"><const>rgb</const></edit>
</match>
I can confirm that it works not only visually but also using the command below:
fc-match --verbose | grep 'rgba\|desktop'
However, on System Settings "Sub-pixel rendering" value shows as unset/"None"
by default.
STEPS TO REPRODUCE
1. Delete original /etc/fonts/conf.d/10-sub-pixel-rgb.conf and create Fedora's
config (link above)
2. Create new user and login with its account
3. Check "System Settings" > "Appearance & Style" > "Text & Fonts" > "Fonts" >
"Sub-pixel rendering"
OBSERVED RESULT
Value for "Sub-pixel rendering" is "None"
EXPECTED RESULT
Value for "Sub-pixel rendering" is "RGB"
SOFTWARE/OS VERSIONS
Linux/KDE Plasma: Fedora 40 Kinoite
KDE Plasma Version: 6.0.0
KDE Frameworks Version: 6.0.0
Qt Version: 6.6.2
ADDITIONAL INFORMATION
It looks like kcm_fonts targets specifically original "10-sub-pixel-rgb.conf".
I wasn't able to tweak Fedora's fontconfig so that kcm_fonts returns the
correct value.
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