Public bug reported: **Reporter:** killaruns **Date:** 2026-10-15
## System information - Ubuntu 26.04 LTS (64-bit) - KDE Plasma 6.6.6 - Wayland session - LibreOffice 26.2.6.3 (X86_64) - Ubuntu package version: 4:26.2.6.3-0ubuntu0.26.04.2 - VCL: kf6 (cairo+wayland) - GPU: Intel UHD Graphics 630 (CoffeeLake-S GT2, 8086:3e92) - Kernel graphics driver: i915 - Locale: ru-RU ## Description LibreOffice Writer displays severe rendering artifacts when scrolling documents with Smooth Scrolling enabled under KDE Plasma 6 and Wayland. The problem includes overlapping or duplicated text, partially rendered lines, and blank horizontal areas that are not correctly repainted. The document content itself is not corrupted. ## Steps to reproduce 1. Start LibreOffice Writer normally under KDE Plasma / Wayland. 2. Open a multi-page text document. 3. Open Tools → Options → LibreOffice Writer → View. 4. Enable Smooth Scrolling. 5. Scroll repeatedly through the document using the mouse wheel. ## Actual result The displayed document becomes visually corrupted. Lines of text overlap, parts of the document disappear, and repainting is incomplete. ## Expected result Text should render correctly during scrolling without artifacts. ## Troubleshooting The following configurations were tested: - GDK_BACKEND=x11 — did not resolve the issue. - SAL_USE_VCLPLUGIN=kf6 with SAL_DISABLESKIA=1 — artifacts persisted. - QT_QPA_PLATFORM=xcb with kf6 and Skia disabled — artifacts persisted. - Qt software rendering environment settings with kf6 and Skia disabled — artifacts persisted. - SAL_USE_VCLPLUGIN=gen with SAL_DISABLESKIA=1 — no artifacts, but native KDE integration is lost. ## Confirmed workaround Disable Smooth Scrolling: Tools → Options → LibreOffice Writer → View → Smooth Scrolling (unchecked). **Result: Rendering artifacts disappear completely.** The native KDE interface (kf6) and Wayland session can both be retained. No video driver replacement or reinstall is required. ## Related upstream bug https://bugs.documentfoundation.org/show_bug.cgi?id=152911 This report describes related scrolling issues under KDE/Wayland, including cases where disabling Smooth Scrolling improves behavior. The present issue specifically concerns text repaint corruption, not just scrolling performance. ## Conclusion Smooth Scrolling is the confirmed trigger for visible rendering corruption on this configuration. Disabling the feature resolves the symptoms. The underlying defect in the rendering or scrolling implementation still requires investigation. ProblemType: Bug DistroRelease: Ubuntu 26.04 Package: libreoffice (not installed) Uname: Linux 7.0.14-1-liquorix-amd64 x86_64 ApportVersion: 2.34.1-0ubuntu0.1 Architecture: amd64 CasperMD5CheckResult: unknown CurrentDesktop: KDE Date: Thu Oct 15 18:11:24 2026 InstallationDate: Installed on 2026-04-27 (171 days ago) InstallationMedia: Kubuntu 26.04 "Resolute Raccoon" - Release amd64 (20260423) SourcePackage: libreoffice UpgradeStatus: No upgrade log present (probably fresh install) ** Affects: libreoffice (Ubuntu) Importance: Undecided Status: New ** Tags: amd64 apport-bug resolute wayland-session ** Attachment added: "Снимок экрана_20261015_181437.png" https://bugs.launchpad.net/bugs/2170999/+attachment/6009460/+files/%D0%A1%D0%BD%D0%B8%D0%BC%D0%BE%D0%BA%20%D1%8D%D0%BA%D1%80%D0%B0%D0%BD%D0%B0_20261015_181437.png -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/2170999 Title: LibreOffice Writer: text rendering artifacts when Smooth Scrolling is enabled (KDE Plasma 6, Wayland) To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/libreoffice/+bug/2170999/+subscriptions -- ubuntu-bugs mailing list [email protected] https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
