LibreOffice / OnlyOffice Blurry Text With KDE Plasma 130% fractional scaling (1440p)
Hey everyone,
I'm running LibreOffice / OnlyOffice on KDE Plasma 6.6 with a 27" 1440p monitor scaled at 130%.
The problem: LibreOffice's UI elements are severely underscaled when run natively—they're too squished together to navigate comfortably.
However, applying QT_QPA_PLATFORM=xcb fixes the sizing but introduces noticeably blurry text rendering. Unfortunately, I need to keep this variable for LibreOffice to function at all—without it, the application barely works properly.
OnlyOffice works fine, but the text rendering is also blurry over there.
Here's what I've tried:
SAL_USE_VCLPLUGIN=qt5/6 without xcb → UI elements too small
QT_QPA_PLATFORM=xcb → This fixed the UI and it looks correct but text is blurry
QT_SCALE_FACTOR=1.33 → just makes everything bigger, no sharpness improvement
QT_AUTO_SCREEN_SCALE_FACTOR=0 → no visible difference
Context: On Windows, both LibreOffice and OnlyOffice render cleanly without any environment tweaks, so this appears specific to the Linux/LibreOffice combination under Wayland.
Goal: Achieve readable UI element sizes at 130% scaling while maintaining crisp, non-blurry text rendering in LibreOffice and crisp, non-blurry text rendering OnlyOffice.
My setup:
Operating System: Kubuntu 26.04
KDE Plasma Version: 6.6.4
KDE Frameworks Version: 6.24.0
Qt Version: 6.10.2
Kernel Version: 7.0.0-27-generic (64-bit)
Graphics Platform: Wayland
Display: Gigabyte G27Q24G, 2560×1440 @ 150% scaling
I need to stay at 130% scaling for readability. Has anyone solved this issue? Thank you in advance guys!