I have also sent the email to [email protected]

I got a reply from Jani Nikula as per below:

"A bisect result on upstream kernel pointing at the regression might be
useful... although we've changed the code considerably since 3.14."

And from Daniel Vetter as per below.

"Yeah, if the bug still persists on latest upstream kernels then a
bisect between 3.11 and 3.10 should be enlightening."

 
The problem is that I don't know how to "bisect" the kernels. I don't even know 
what it means.
I am no linux super user. I am just experienced up to a certain level.
The things I am asked to do become more and more complicated and I cannot keep 
up, I am sorry.

Could you forward the above bug report to whoever you feel is more
appropriate? I really hope that developers already have enough info to
find the culprit.

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https://bugs.launchpad.net/bugs/1229591

Title:
  8086:0116 [Dell Inspiron 14z (N411z)] Display brightness keys don't
  generate evdev events after saucy upgrade

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