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Setting the initial state of input-device switches must be done before registering the input-device. Otherwise the initial state will get send out as an event as soon as input_sync() gets called. E.g. when undocking a tablet using intel-vbtn to report SW_TABLET_MODE and SW_DOCK before this commit we would get (evemu-record output): E: 0.000001 0005 0005 0001 # EV_SW / SW_DOCK 1 E: 0.000001 0000 0000 0000 # ------------ SYN_REPORT (0) ---------- +0ms E: 0.000109 0005 0005 0000 # EV_SW / SW_DOCK 0 E: 0.000109 0000 0000 0000 # ------------ SYN_REPORT (0) ---------- +0ms E: 0.000133 0005 0001 0001 # EV_SW / SW_TABLET_MODE 1 E: 0.000133 0000 0000 0000 # ------------ SYN_REPORT (0) ---------- +0ms The first SW_DOCK=1 report is spurious, setting the initial switch state before registering the input-device fixes this. Signed-off-by: Hans de Goede <hdegoede@redhat.com> Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.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.