STEPS TO REPRODUCE 1. Start with a laptop with a builtin display (1920x1080, no scaling) 2. Connect an external HDMI monitor (4K), configure it to have 2x scaling 3. Disconnect the external monitor again OBSERVED RESULT The builtin display now has 2x scale EXPECTED RESULT The builtin monitor's scale remains at 1x SOFTWARE/OS VERSIONS KDE Plasma Version: master KDE Frameworks Version: master Qt Version: 5.15.5+kde ADDITIONAL INFORMATION Wayland
Created attachment 150737 [details] KScreen config .local/share/kscreen/ before (only Laptop), during (both screens), and after (only Laptop again)
Created attachment 150738 [details] EDID information
What's probably worth noting is that the KCM shows my external monitor as "AU Optronics". That is actually the manufacturer of the builtin display.
kscreen-doctor -o shows both monitors as "AU Optronics" Output: 1 AU Optronics eDP-1-unknown enabled connected primary Panel Modes: 0:1920x1080@60*! 1:1280x1024@60 2:1280x800@60 3:1600x900@60 4:1368x768@60 5:1280x720@60 Geometry: 0,1080 1920x1080 Scale: 1 Rotation: 1 Overscan: 0 Vrr: incapable RgbRange: Automatic primary Output: 2 AU Optronics HDMI-A-2-unknown enabled connected HDMI Modes: 0:3840x2160@30*! 1:3840x2160@30 2:3840x2160@30 3:3840x2160@30 4:3840x2160@25 5:3840x2160@24 6:3840x2160@24 7:2560x1440@60 8:1920x1080@60 9:1920x1080@60 10:1920x1080@60 11:1920x1080@60 12:1920x1080@60 13:1920x1080@60 14:1920x1080@50 15:1920x1080@50 16:1920x1080@50 17:1920x1080@30 18:1920x1080@30 19:1920x1080@25 20:1920x1080@24 21:1920x1080@24 22:1600x1200@60 23:1600x900@60 24:1280x1024@75 25:1280x1024@60 26:1152x864@75 27:1280x720@60 28:1280x720@60 29:1280x720@50 30:1024x768@75 31:1024x768@60 32:800x600@75 33:800x600@60 34:720x576@50 35:720x576@50 36:720x576@50 37:720x576@50 38:720x480@60 39:720x480@60 40:720x480@60 41:720x480@60 42:720x480@60 43:720x480@60 44:720x480@60 45:720x480@60 46:640x480@75 47:640x480@60 48:640x480@60 49:640x480@60 50:720x400@70 51:2560x1600@60 52:1920x1200@60 53:1280x800@60 54:3200x1800@60 55:2880x1620@60 56:1368x768@60 Geometry: 1,0 3840x2160 Scale: 1 Rotation: 1 Overscan: 0 Vrr: incapable RgbRange: Automatic
This seems to be a regression compared to 5.25.3 Output: 1 AU Optronics eDP-1-unknown enabled connected primary Panel Modes: 0:1920x1080@60*! 1:1280x1024@60 2:1280x800@60 3:1600x900@60 4:1368x768@60 5:1280x720@60 Geometry: 0,1080 1920x1080 Scale: 1 Rotation: 1 Overscan: 0 Vrr: incapable RgbRange: Automatic primary Output: 2 Dell Inc. DELL P2415Q/D8VXF0150C7B enabled connected HDMI Modes: 0:3840x2160@30*! 1:3840x2160@30 2:3840x2160@30 3:3840x2160@30 4:3840x2160@25 5:3840x2160@24 6:3840x2160@24 7:2560x1440@60 8:1920x1080@60 9:1920x1080@60 10:1920x1080@60 11:1920x1080@60 12:1920x1080@60 13:1920x1080@60 14:1920x1080@50 15:1920x1080@50 16:1920x1080@50 17:1920x1080@30 18:1920x1080@30 19:1920x1080@25 20:1920x1080@24 21:1920x1080@24 22:1600x1200@60 23:1600x900@60 24:1280x1024@75 25:1280x1024@60 26:1152x864@75 27:1280x720@60 28:1280x720@60 29:1280x720@50 30:1024x768@75 31:1024x768@60 32:800x600@75 33:800x600@60 34:720x576@50 35:720x576@50 36:720x576@50 37:720x576@50 38:720x480@60 39:720x480@60 40:720x480@60 41:720x480@60 42:720x480@60 43:720x480@60 44:720x480@60 45:720x480@60 46:640x480@75 47:640x480@60 48:640x480@60 49:640x480@60 50:720x400@70 51:2560x1600@60 52:1920x1200@60 53:1280x800@60 54:3200x1800@60 55:2880x1620@60 56:1368x768@60 Geometry: 1,0 1920x1080 Scale: 2 Rotation: 1 Overscan: 0 Vrr: incapable RgbRange: Automatic
>This seems to be a regression compared to 5.25.3 Can you double check that? Nothing has changed in libkscreen between master and 5.25.3, on kscreen itself only OSD changes and you removing a useless member var.
A possibly relevant merge request was started @ https://invent.kde.org/plasma/kwin/-/merge_requests/2693
Seems to be be fixed by https://invent.kde.org/plasma/kwin/-/merge_requests/2777