Bug ID: 217683
           Summary: Brightness can only be changed once on some HP laptops
           Product: ACPI
           Version: 2.5
          Hardware: All
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: P3
         Component: Power-Video
        Regression: No

Because ACPI video's child devices aren't put to D0 at boot, and the panel
brightness on those devices requires _PS0 being evaluated to work properly.

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