I can confirm this bug on Toshiba satelite u920t. It seems to be related to 
some plasma widgets. How to reproduce:
- Change menu to classic (it makes this bug to happen unpredictably)
- add any plasmoid on desktop
- logout/login
- touchscreen will work until you touch plasmoid on desktop
- restart plasma-desktop (killall plasma-desktop, plasma-desktop)
- touchscreen works again
- doesn't happen if you touch plasmoid, that is set as desktop background 
(folderview, etc.)

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https://bugs.launchpad.net/bugs/1162216

Title:
  touchscreen does not tap - sometimes

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