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Pass-through mode disables all gamma and brightness processing, sending the raw pixel data directly to the LEDs. It is enabled by setting the brightness to zero, either in Device Tree or using the runtime method of writing a single byte (in this case 0) to the device. See: https://github.com/raspberrypi/linux/issues/7108 Signed-off-by: Phil Elwell <phil@raspberrypi.com>