I've tested it with v4.4-rc4-wily, and the bug does not exist, leaving
only intel_backlight with the default GRUB configuration (no extra
options except "quiet splash").

While installing the upstream kernel, though, there was a warning:
          W: Possible missing firmware /lib/firmware/i915/skl_guc_ver4.bin for 
module i915


** Tags removed: kernel-bug-exists-upstream
** Tags added: kernel-bug-fixed-upstream kernel-bug-fixed-upstream-4.4-rc4

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

** Tags added: wily

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https://bugs.launchpad.net/bugs/1486896

Title:
  On Lenovo Thinkpad Edge E330, the screen backlight flickers badly.

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