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.
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2Are you sure compositing is enabled? `Shift+Alt+F12` toggles compositing which is needed for certain desktop effects including `Ctrl+F9`. – DK Bose May 04 '19 at 01:36
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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:
DK Bose
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Thanks for answer. Checked "supportInformation" - "useCompositing: true". In system settings corresponding checkbox is already checked. Ctrl-F9 still does not work. – Dmitriy Vinokurov May 04 '19 at 08:37
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1Question was about my personal laptop, now I faced same trouble on work PC. Compositing was enabled but command from this post shows "Compositing is not active". I solved it switching to XRender instead of OpenGL. – Dmitriy Vinokurov Jun 10 '19 at 11:56
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lspci shows "NVIDIA Corporation GF119 [GeForce GT 610] (rev a1)" – Dmitriy Vinokurov Jun 10 '19 at 12:06