- I did a clean install of Ubuntu 14.04 64bit Desktop and experience the same 
behaviour. Random freezes of the screen, but all the applications keep running 
in the background. 
- Reproduced it with Unity and Gnome (2 and 3) with the nvidia-latest driver 
(304.121). Other drivers are not working properly with my GeForce 6100.
-Work-around is going to the shell and back again (ctrl+alt+tab+F1 and 
ctrl+alt+tab+f7)

Did not have this problem with previous versions of Ubuntu (=<13.04)

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https://bugs.launchpad.net/bugs/1310762

Title:
  [HP ZBook 15 Mobile Workstation] Ubuntu 14.04 random freeze and lock
  up

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