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Currently there're 2 different implementations of the driver for DisplayLink USB2.0-to-HDMI/DVI adapters: older FBDEV and modern true DRM. We initially decided to use FBDEV version just because with it /dev/fbX is usable from user-space while in DRM version with DRM_FBDEV_EMULATION user-space cannot draw anything on a real screen, for more info read [1]. But today /dev/fbX is not that important as more and more software projects switch to use of DRI (/dev/dri/cardX). But what's even more important DRM driver allows building of complicated graphics processing chains. The most important for us is rendering of 3D on a dedicated GPU while outputting video through a simpler bitstreamer like DisplayLink. So let's use much more future-proof driver from now on. [1] https://lists.freedesktop.org/archives/dri-devel/2017-December/159519.html Signed-off-by: Alexey Brodkin <abrodkin@synopsys.com> Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
Linux kernel ============ This file was moved to Documentation/admin-guide/README.rst Please notice that there are several guides for kernel developers and users. These guides can be rendered in a number of formats, like HTML and PDF. In order to build the documentation, use ``make htmldocs`` or ``make pdfdocs``. There are various text files in the Documentation/ subdirectory, several of them using the Restructured Text markup notation. See Documentation/00-INDEX for a list of what is contained in each file. 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.