Sure there is something more proactive that can be done than mere testing of 
new kernels and BIOSes?
It should be possible to isolate the cause of the problem by comparing the 
diffs between  4.2.0-040200 and 4.2.0-35-generic, as I mentioned above.

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https://bugs.launchpad.net/bugs/1580311

Title:
  Laptop panel output only if external display connected

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