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Description of problem: I have a macbook pro with retina display. When I attach a monitor to that with a lower dpi xwayland windows are still scaled as if they are displayed on the hidpi screen. ie, they are huge. Version-Release number of selected component (if applicable): Fedora 25 xorg-x11-server-Xwayland-1.19.0-0.3.20161026.fc25.x86_64 Steps to Reproduce: 1. Attach a regular dpi screen to a hidpi laptop. 2. Open Firefox. 3. Move the window over to the regular dpi screen. Actual results: Windows are huge on the regular dpi screen Expected results: Windows would be displayed at regular size
I have a very similar issue. Fresh install xorg-x11-server-Xwayland-1.19.0-0.8.rc2.fc25.x86_64 top display is a left-rotated external Dell 1920x1200 16:10 bottom display: builtin Lenovo X1 Carbon 2560x1440 (16:9) The attached screenshots (under and over) show how the screens look when the chrome window is in the laptop display (under) and the same window moved to the Dell display. The capture has been scaled to the size of the screens (the laptop screen being as physically wide as the dell is when rotated).
Created attachment 1222979 [details] capture with chrome in the lower display
Created attachment 1222980 [details] capture with chrome in the upper display
Things only work as expected (ie: the physical window size is the same when moving the window from display to display) when I set the laptop's display to 1368x768 (16:9) and keep the left-rotated dell display at 1920x1200 (16:10) [so 1200x1920]. I guess the with of both then (1200 vs 1368) that it looks almost the same. It is like the same DPI calculation is being used for both displays for X apps (vs wayland apps, that are scaled properly in either case).
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