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commit059500940d(ACPI/video: export acpi_video_get_levels) mistakenly dropped the correct value of max_level and that caused the set_level function following failed and the acpi_video backlight interface didn't get created. Fix this by passing back the correct max_level value. While at it, also fix the param used in acpi_video_device_lcd_query_levels where acpi_handle is expected but acpi_video_device is passed. Fixes:059500940d(ACPI/video: export acpi_video_get_levels) Reported-and-tested-by: Valdis Kletnieks <valdis.kletnieks@vt.edu> Signed-off-by: Aaron Lu <aaron.lu@intel.com> Acked-by: Zhang Rui <rui.zhang@intel.com> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>