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As far as I remember, on previous Kubuntu version (18.10) when I hit Ctrl-F9 - KWin shows all open windows. But after upgrade to 19.04 it does not work anymore. In hotkeys settings Ctrl-F9 is still shortcut for this feature, but when I press it - nothing happens and I don't know neither how to launch it from command line to see errors nor where to see logs.

Dmitrii Vinokurov
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1 Answers1

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Present Windows is a desktop effect. For it, and certain other desktop effects, to work, compositing needs to be enabled. You can check the status by opening a terminal and running: 

qdbus org.kde.KWin /KWin supportInformation | grep -i composit

You may see something like this as the output:

Composite: yes; Version: 0x4
compositingMode: 1
useCompositing: true
compositingInitialized: true
windowsBlockCompositing: true
Compositing
Compositing is active
Compositing Type: OpenGL

You can toggle compositing on and off using Shift+Alt+F12.

Alternatively, use the GUI to ensure that compositing is turned on when the system starts:

Set compositing enabled on startup

DK Bose
  • 44,553