This issues was before upgrade to current Ubuntu version. There were no kernel 
that work properly with this stuff.
I've installed kernel 4.9.0-040900rc1-generic. And miracle happen. Brightness 
hotkeys works and do brightness change. acpi_listen shows "button/lid LID 
close" and "button/lid LID open". Suspend didn't happen when I close the lid, 
but it is another story.

** Changed in: linux (Ubuntu)
       Status: Incomplete => Confirmed

** Tags added: kernel-fixed-upstream

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https://bugs.launchpad.net/bugs/1634742

Title:
  No button/lid events, no brightness hotkeys

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