Hallo. 
I have the exact same noise problem on headphones 
on brand-new HP Zbook 15 G2. 
(more infos here: 
http://askubuntu.com/questions/599539/noise-on-headphones-on-hp-zbook-15-g2-with-ubuntu-14-04-2-or-14-10)
Marios workaround didn't work for me...

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https://bugs.launchpad.net/bugs/1315770

Title:
  [Dell Precision M3800, Realtek ALC668, Black Headphone Out, Left]
  Strong background noise

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