When any window is on the desktop I can't use krunner, application launcher, application menu and applet windows (e.g. Networks, Calendar, ...). All of them just blink and won't show up. Only Application Dashboard works normally. If all windows are minimized (nothing on the desktop) everything works again. Reproducible: Always Steps to Reproduce: 1. click on an icon on system tray or press ALT+F2 to show krunner or ALT+F1 to show launcher Actual Results: a window just shortly blinks and nothing more happens Expected Results: a window is shown Kubuntu: 16.04 KDE Plasma: 5.6.5 KDE Frameworks: 5.23.0 Qt: 5.5.1 Kernel: 4.4.0-28-generic OS Type: 64-bit
please attach the output of "qdbus org.kde.KWin /KWin supportInformation" and ensure this doesn't happen w/ suspended compositor (SHIFT+Alt+F12) This only affects plasma windows, ie. kwrite still shows up fine?
Created attachment 100184 [details] qdbus org.kde.KWin /KWin supportInformation
It affects just windows that should be shown over running app in a normal window. For instance if I have maximized Firefox and click on time on bottom right to show calendar it won't show. But if I minimize all running apps (empty desktop) it works and the calendar is shown as expected.
Something tells me this is related to bug #350826 resp. bug #365685
> OpenGL version string: 3.3 (Core Profile) Mesa 11.2.0 Please try OpenGL 2 compositor.
Yes, that was it. I switched to OpenGL 2 and the problem is gone. The setting is here: System Settings / Display / Compositor / Rendering backend / OpenGL2.0 Then I wanted to log out and log in to apply change but Plasma got frozen (just black screen and mouse cursor) so I had to restart the sddm service from console. Thank you for your help.
Correction: krunner still doesn't work. It behaves like I described before. Just blinks and nothing more.
Please check against the xrender compositor, but > if I minimize all running apps (empty desktop) it works and the calendar is shown as expected really makes me believe it's the window type juggling, notably since only QML clients seem affected.
With xrender krunner shows but looses focus (I have to click inside to type), draws border around the close button and can't be closed with Esc. On top of it I switched back to OpenGL 2 which worked before and it stopped working too.
Is this issue still relevant for you?
(In reply to Alexander Mentyu from comment #10) > Is this issue still relevant for you? No. That was a long time ago. I think it could be closed. Thanks.