Created attachment 160926 [details] Shows the problem in four images. Top ones are the settings, and bottom ones are the physical screen being replicated on SUMMARY When replicating screen 1 onto screen 2, with screen 1 having a larger resolution than screen 2, screen 2 will only show parts of screen 1. STEPS TO REPRODUCE 1. Have two screens with different resolutions 2. Go into Display Configuration 3. Select the smaller screen 4. Set "Replica of:" to the larger screen OBSERVED RESULT The replicated screen only shows the top left part of the original image EXPECTED RESULT The screen should be scaled down to match the target resolution SOFTWARE/OS VERSIONS Linux: Archlinux Kernel: 6.4.7-arch1-3 KDE Plasma Version: 5.27.7 KDE Frameworks Version: 5.108.0 Qt Version: 5.15.10 ADDITIONAL INFORMATION None
Are you using the Wayland session or the X11 session?
I'm using X11
I had a feeling. This use case is not well-supported on X11. In particular, the mixed-DPI multi-screen use case is explicitly unsupported. For that, we recommend using the Wayland session. However in this case maybe there's some way we can improve the situation simply by setting both screens to the same resolution--if there's any intersection between the resolutions that each screen supports. If there isn't, then there's not much we can do with the existing X11 backend. Regardless, I recommend using the Wayland session if a better multi-screen experience is important.
Adding the x11-only keyword