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commit78dfc9d1d1upstream. Allow callers of __acpi_video_get_backlight_type() to pass a pointer to a bool which will get set to false if the backlight-type comes from the cmdline or a DMI quirk and set to true if auto-detection was used. And make __acpi_video_get_backlight_type() non static so that it can be called directly outside of video_detect.c . While at it turn the acpi_video_get_backlight_type() and acpi_video_backlight_use_native() wrappers into static inline functions in include/acpi/video.h, so that we need to export one less symbol. Fixes:5aa9d943e9("ACPI: video: Don't enable fallback path for creating ACPI backlight by default") Cc: All applicable <stable@vger.kernel.org> Reviewed-by: Mario Limonciello <mario.limonciello@amd.com> Signed-off-by: Hans de Goede <hdegoede@redhat.com> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>