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This adds dual fan control for the following models: P50, P51, P52, P70, P71, P72, P1 gen1, P2 gen2, X1E gen1 and X1E gen2. Both fans are controlled together as if they were a single fan. Tested on an X1 Extreme Gen1, an X1 Extreme Gen2, and a P50. The patch is defensive, it adds only specific supported machines, and falls back to the old behavior if both fans cannot be controlled. Background: I tested the BIOS default behavior on my X1E gen2 and both fans are always changed together. So rather than adding controls for each fan, this controls both fans together as the BIOS would do. This was inspired by a discussion on dual fan support for the thinkfan tool (see link below). All BIOS IDs are taken from there. The X1E gen2 ID is verified on my machine. Thanks to GitHub users voidworker and civic9 for the earlier patches and BIOS IDs, and to users peter-stoll and sassman for testing the patch on their machines. BugLink: https://github.com/vmatare/thinkfan/issues/58 Signed-off-by: Lars Hofhansl <larsh@apache.org> [andy: massaged commit message to capitalize ID and convert to BugLink] 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.