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The automatic selection may not correspond with the correct backlight (such as in a multi-gpu, multi-panel device) or the user may simply prefer another control interface. This allows them to override the chosen interface using Option "Backlight" "my-backlight" to specify '/sys/class/backlight/my-backlight' as the interface to use instead. Suggested-by: Alon Levy <alevy@redhat.com> References: https://bugs.freedesktop.org/show_bug.cgi?id=29273 Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>