https://bugzilla.kernel.org/show_bug.cgi?id=62891

            Bug ID: 62891
           Summary: MacBook Air 6,2 (2013) brightness is not well
                    calibrated
           Product: ACPI
           Version: 2.5
    Kernel Version: 3.12-rc4
          Hardware: x86-64
                OS: Linux
              Tree: Mainline
            Status: NEW
          Severity: normal
          Priority: P1
         Component: Power-Video
          Assignee: [email protected]
          Reporter: [email protected]
        Regression: No

When turning up (or down) the screen brightness level there's no good
calibration of the brightness itself. There are no "standard" steps (such as
+/- 5%) instead sometimes the screen gets really bright (with one step-up) and
sometimes the change is tiny. This does not happen in OSX.

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