problem seems to be in package ubuntu-drivers-common...
upgrading it from v0.2.91.5 to v0.2.91.6 from trusty-proposed repo on Jun 27th 
caused the same problem as upgrading it from v0.2.91.5 to v0.2.91.7 from 
trusty-updates this time
I was only able to downgrade it to v0.2.91.4 using synaptics. However, problem 
is gone... Everythig works fine now...

** Package changed: unity (Ubuntu) => ubuntu-drivers-common (Ubuntu)

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https://bugs.launchpad.net/bugs/1379084

Title:
  After updating ubuntu using software updater built-in notebook display
  in multi-display configuration keeps showing boot screen

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