https://bugs.kde.org/show_bug.cgi?id=462164
Bug ID: 462164 Summary: [x11] Window contents are blurry when restoring a maximized window by dragging the title bar Classification: Plasma Product: kwin Version: 5.26.3 Platform: Archlinux OS: Linux Status: REPORTED Severity: normal Priority: NOR Component: compositing Assignee: kwin-bugs-n...@kde.org Reporter: marcus.gur...@gmail.com Target Milestone: --- Created attachment 153974 --> https://bugs.kde.org/attachment.cgi?id=153974&action=edit Window content blur demonstration. SUMMARY *** As mentioned in the title, window contents become blurry when restoring a maximized window by dragging the title bar. The amount of blur seems to vary each time I try this but it happens basically every time I do it. This happens only with compositing enabled. To me it seems like window coordinates are not rounded to full pixels and due to this subpixel shift to the window coordinates it appears blurry. E.g. when I screenshot only the blurred window with spectacle, it appears sharp, but when I screenshot the whole desktop the blur is visible. *** STEPS TO REPRODUCE See the attached video for a demonstration which also includes the steps to reproduce. Please watch it at native 1920x1080 resolution without scaling to better see the difference in sharpness. OBSERVED RESULT Window contents appear blurry. EXPECTED RESULT Window contents appear sharp with no additional blur added by the compositor. SOFTWARE/OS VERSIONS Linux/KDE Plasma: Arch Linux / 5.26.3 (available in About System) KDE Plasma Version: 5.26.3 KDE Frameworks Version: 5.100.0 Qt Version: 5.15.7+kde+r175-1 -- You are receiving this mail because: You are watching all bug changes.