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The simple panel code uses the backlight interface to find a device, which fails when backlight is disabled: drivers/built-in.o: In function `panel_simple_platform_probe': :(.text+0xd3c48): undefined reference to `of_find_backlight_by_node' Signed-off-by: Arnd Bergmann <arnd@arndb.de> Signed-off-by: Dave Airlie <airlied@gmail.com>