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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>
Linux kernel
There are several guides for kernel developers and users. These guides can be rendered in a number of formats, like HTML and PDF. Please read Documentation/admin-guide/README.rst first.
In order to build the documentation, use make htmldocs or
make pdfdocs. The formatted documentation can also be read online at:
https://www.kernel.org/doc/html/latest/
There are various text files in the Documentation/ subdirectory, several of them using the Restructured Text markup notation.
Please read the Documentation/process/changes.rst file, as it contains the requirements for building and running the kernel, and information about the problems which may result by upgrading your kernel.
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