> I now need the 'noapic' flag in my boot options again.
> Is this the same bug, or a different issue?

Dunno, but it's a quite interesting clue.
Thanks for copying your info upstream, hopefully it'll give them some specific 
ideas.

Glad to hear that toggling the LVDS1 serves as a workaround.  It also
suggests there may be a race condition going on here or something.  I'm
curious what ratio of times it works, roughly?  Like 10%?  50%?  75%?

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https://bugs.launchpad.net/bugs/912992

Title:
  [snb-m-gt2+] Primary laptop display not working, external monitor
  works fine.

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