SUMMARY I have a dual-monitor setup: a 4K (3840x2160) laptop 15.6" screen and a 1920x1200 external 24" monitor (Dell U2413). Here is kscreen-console dump: https://invent.kde.org/snippets/1098 STEPS TO REPRODUCE 1. Log in to Wayland session 2. Set scaling to be fractional (e.g. 195% = 1.95) on one monitor 3. Connect external screen (leave it at 100% scaling) OBSERVED RESULT There is a slight overlapping of displays. E.g. when a window is moved to the side of the screen, which is adjacent to the other screen, a few pixels of the window (close to the screen edge) are also duplicated on the other screen. I.e. I can see the same pixels drawn twice. And this cannot be remedied by moving display arrangement in the System Settings: as long as displays are adjacent there is the overlap. EXPECTED RESULT The displays should not overlap no matter the scaling. SOFTWARE/OS VERSIONS Linux: Kubuntu 20.04 KDE Plasma Version: 5.18.5 KDE Frameworks Version: 5.68.0 Qt Version: 5.12.8 ADDITIONAL INFORMATION This only happens on Wayland session.
Update: this is still relevant with Kubuntu 20.10 (development branch) and KDE Plasma 5.19.4, KDE Frameworks 5.72.0 and Qt 5.14.2
Thank you for the bug report. Unfortunately we were not able to get to it yet. Can we ask you to please check if this is still an issue with Plasma 5.25 or 5.26? If it is, please change the status to CONFIRMED when replying. If not, or if you can't because you no longer use this setup, you can change the status to RESOLVED WORKSFORME. Thanks a lot!
Still relevant with Plasma 5.25.5 on Ubuntu 22.10. I can work around the problem by dragging the scaled display and re-aligning (re-sticking) to the side of the non-scaled one. So the issue might be in the initial positioning when the re-scale is applied.
Thanks. I think it's Bug 455394. *** This bug has been marked as a duplicate of bug 455394 ***