Created attachment 131521 [details] Screenshot with error message SUMMARY "Night color control" addon isn't working, getting error: "Failed to connect to the window manager" STEPS TO REPRODUCE 1. Open "Night color control" from system tray OBSERVED RESULT Getting error: "Failed to connect to the window manager" EXPECTED RESULT "Night color control" working, getting error: "Failed to connect to the window manager" SOFTWARE/OS VERSIONS Linux/KDE Plasma: Linux deroManjaro 5.8.3-2-MANJARO KDE Plasma Version: 5.19.4 KDE Frameworks Version: 5.73.0 Qt Version: 5.15.0 ADDITIONAL INFORMATION i3 WM + Plasma If you needs a logs, please tell how te get it.
Resolving as "not a bug" because Night Color is feature of KWin, and Night Color Control is just GUI for controlling it. You are using i3wm which doesn't have feature like "Night Color" and thus support for it cannot even be added. P.S. I found on a web some mentions of "redshift" program to achieve this feature in i3wm.