The file xorg.conf is a file used for configuring the X.Org Server. While typically located in /etc/X11/xorg.conf, its location may vary across operating systems.
For a long time, editing xorg.conf was necessary for advanced input devices and multiple monitor output to work correctly. This was regarded to be a major usability obstacle. In modern systems this is seldom necessary due to input hotplugging and the XRandR extension integrated into new X.org releases. Some devices still require manual editing, notably certain NVIDIA products, whose drivers do not support these technologies.
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