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76f27bdd765bc2a94694eba85051ba21529ffd2b
Switch is no longer available in kernel 4.19, so we use extcon instead. the hdmi connect status node: /sys/class/extcon/extconX/state HDMI=0: hdmi is disconnected HDMI=1: hdmi is connected Change-Id: I806d8fd5b9b4b36f15aa6aec275fad2ecf122e91 Signed-off-by: Algea Cao <algea.cao@rock-chips.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.
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.
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