https://bugzilla.kernel.org/show_bug.cgi?id=108971

            Bug ID: 108971
           Summary: [Samsung NP530U4E-K02PL] Cannot change backlight
           Product: ACPI
           Version: 2.5
    Kernel Version: 4.4.0-040400rc3-generic
          Hardware: Intel
                OS: Linux
              Tree: Mainline
            Status: NEW
          Severity: normal
          Priority: P1
         Component: Power-Video
          Assignee: [email protected]
          Reporter: [email protected]
        Regression: No

Created attachment 196491
  --> https://bugzilla.kernel.org/attachment.cgi?id=196491&action=edit
acpidump output

It is not possible to change screen backlight. A workaround is to add
a flag acpi_osi=

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