How to enable fractional scaling in Kubuntu (KDE)

Enabling fractional scaling on Kubuntu provides fine-grained control over display settings for high-resolution monitors. It allows precise scaling factors that improve readability without sacrificing screen space. This feature enhances the visual experience by offering intermediate scaling levels between the standard 100% and 200% steps.

Some KDE Plasma releases support fractional scaling out of the box, primarily when running the Wayland session. Earlier versions of Kubuntu may have limited compatibility on X11, and certain older graphics drivers might not fully support fractional scaling. Checking for updates and ensuring recent KDE packages are installed helps maintain stable display performance.

Adjusting the scaling factor may demand additional resources from the graphics subsystem. High-DPI monitors benefit most from fractional scaling, but the feature can introduce minor performance overhead. Maintaining a balance between readability and efficiency can help maximize overall system responsiveness.

1. Open the System Settings application from the main menu or the application launcher.
2. Select Display and Monitor from the left-hand panel.
3. Choose the appropriate monitor if multiple displays are present Display Configuration.
4. Adjust the scaling factor slider to the desired fractional percentage level in Global scale.
5. Click “Apply” to confirm the changes, and wait for the new scaling to take effect.
6. Log out and log back in for the scaling to reflect system-wide.

   Some configurations require a restart of the graphical session for changes to persist.

7. Switch to Wayland if fractional scaling options are not visible on X11.

   Check the session type on the login screen or in the About section under System Settings.

8. Adjust further for comfort by selecting a higher or lower scaling factor if necessary.