A custom gamma LUT is used, but the table is not calculated at startup, resulting in an all 0's frame. Use the drfault LUT specified in the Linux kernel as a first estimation. Reported-by: Paul Elder <paul.elder@ideasonboard.com> Signed-off-by: Jean-Michel Hautbois <jeanmichel.hautbois@ideasonboard.com> Tested-by: Paul Elder <paul.elder@ideasonboard.com> Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com> Reviewed-by: Paul Elder <paul.elder@ideasonboard.com>