https://bugs.kde.org/show_bug.cgi?id=430659
Bug ID: 430659 Summary: external monitor flickering Product: plasmashell Version: 5.19.5 Platform: Kubuntu Packages OS: Linux Status: REPORTED Severity: normal Priority: NOR Component: general Assignee: k...@davidedmundson.co.uk Reporter: lucapaolom...@gmail.com CC: plasma-b...@kde.org Target Milestone: 1.0 SUMMARY Running Kubuntu on a laptop, the windows of some applications have random flickering when moved to an external monitor, whereas the laptop monitor always works correctly. In the worst cases the external monitor becomes black until the flickering window is closed. STEPS TO REPRODUCE With Kubuntu on a laptop, the window of an application that is opened or moved to an external monitor flickers, and in some cases the external monitor becomes black. This happens very often but only with some apps: for example Thunderbird and Firefox, and sometimes Libreoffice, but not Chrome (and the KDE apps I tested work well too). The external monitor is connected to the laptop with a VGA cable. I have already tried what follows, with no results: -- when possible, disabled hardware acceleration in the concerned apps; -- set the external monitor as a replica or an extension of the laptop monitor; -- changed the external monitor Refresh rate and Resolution; -- changed all parameters of the Compositor (Scale method, Rendering backend, Tearing prevention); -- changed XOrg to Wayland. Operating System: Kubuntu 20.10 KDE Plasma Version: 5.19.5 KDE Frameworks Version: 5.74.0 Qt Version: 5.14.2 Kernel Version: 5.8.0-33-generic OS Type: 64-bit Processors: 4 × Intel® Core™ i7-7500U CPU @ 2.70GHz Memory: 7,5 GiB of RAM Graphics Processor: Mesa Intel® HD Graphics 620 -- You are receiving this mail because: You are watching all bug changes.