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Use acpi_video_get_backlight_type() to determine if we should register the panasonic specific backlight interface. To avoid registering this on systems where the ACPI or GPU native backlight control methods should be used instead. Tested-by: Stefan Seyfried <seife+kernel@b1-systems.com> Tested-by: Kenneth Chan <kenneth.t.chan@gmail.com> Signed-off-by: Hans de Goede <hdegoede@redhat.com> Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com> Link: https://lore.kernel.org/r/20220624112340.10130-8-hdegoede@redhat.com