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If the `amd-pstate` driver is not loaded automatically by default, it is because the kernel command line parameter has not been added. To resolve this issue, it is necessary to call the `amd_pstate_set_driver()` function to enable the desired mode (passive/active/guided) before registering the driver instance. This ensures that the driver is loaded correctly without relying on the kernel command line parameter. When there is no parameter added to command line, Kernel config will provide the default mode to load. Meanwhile, user can add driver mode in command line which will override the kernel config default option. Reported-by: Andrei Amuraritei <andamu@posteo.net> Closes: https://bugzilla.kernel.org/show_bug.cgi?id=218705 Signed-off-by: Perry Yuan <perry.yuan@amd.com> Reviewed-by: Mario Limonciello <mario.limonciello@amd.com> Link: https://lore.kernel.org/r/83301c4cea4f92fb19e14b23f2bac7facfd8bdbb.1718811234.git.perry.yuan@amd.com Signed-off-by: Mario Limonciello <mario.limonciello@amd.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 reStructuredText 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.