ACPI / video: Fix applying indexed initial brightness value.
The value initially read via _BQC also needs to be offset by 2 to compensate for the first 2 special items in _BCL. Introduce a helper function that does the BQC-value-to-level conversion in order to not needlessly duplicate code. Signed-off-by: Danny Baumann <dannybaumann@web.de> Reviewed-by: Aaron Lu <aaron.lu@intel.com> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
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