Created attachment 148050 [details] image showing text distortion, and text without distortion SUMMARY Monitor A is scaled to 200% Monitor B is scaled to 100% Opening the system settings menu on Monitor B results in distorted text. Moving the window from Monitor B to Monitor A, and then back to Monitor B corrects the text distortion until a new settings tab is selected. STEPS TO REPRODUCE 1. Start with two screens, Monitor A at 200% scale, Monitor B at 100% scale. 2. Open System Settings on Monitor B 3. Observe text distortion. 4. Move settings window from Monitor B to Monitor A 5. Observe text is displayed correctly. 6. Move settings window from Monitor A back to Monitor B 7. Observe text is displayed correctly. OBSERVED RESULT Text is distorted when the settings menu is used on Monitor B. After moving the settings menu from Monitor A to Monitor B the text is not distorted on Monitor B. EXPECTED RESULT No text distortion on Monitor B. SOFTWARE/OS VERSIONS Linux: 5.16.18-200.fc35.x86_64 KDE Plasma Version: 5.24.4 KDE Frameworks Version: 5.92.0 Qt Version: 5.15.2 ADDITIONAL INFORMATION N/A
I can confirm this issue with a similar arrangement with one scaled screen and one unscaled screen. When you move the window between screens, the rendering changes seemingly from blocky pixelation to smooth pixelation. Another funny thing happens for me: some text elements in affected windows will draw correctly, while others will remain pixelated!
Created attachment 148057 [details] Partially-pixelated text strings, exhibit a (See "Night color")
Created attachment 148058 [details] Partially-pixelated text strings, exhibit b (compare combobox text to other text)
This will be fixed in upstream Qt 6.5