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Don't consider enabled but zero duty cycle backlight disabled. Clamp level between min and max for sanity. Signed-off-by: Jani Nikula <jani.nikula@intel.com> Link: http://patchwork.freedesktop.org/patch/msgid/1471939811-9817-1-git-send-email-maarten.lankhorst@linux.intel.com Signed-off-by: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>