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 I am sure that the problem is not solved. My version of plama-workspace is : dpkg -l|grep plasma-workspace  The problem  CPU >100% appears often when i open  and click to the icon Firefox on the taskbar QXcbConnection: XCB error: 2 (BadValue), sequence: 36336, resource id: 71303772, major code: 142 (Unknown), minor code: 3 no more messages and top give CPU > 100% When the problem arrived i kill the process plasmashell and i restart plasmashell. I don't know if this error message can help you to solve thr problem 
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