Improved backlight devices selection
1. Change backlight devices selection order, return more early; 2. Only check raw type devices's enable attribute. If no raw device available, we will search again without above checking. BUG: 399646
1. Change backlight devices selection order, return more early; 2. Only check raw type devices's enable attribute. If no raw device available, we will search again without above checking. BUG: 399646
mentioned in commit c6b7c714
·mentioned in commit c6b7c714