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If ACPI_FADT_LOW_POWER_S0 is not set, this doesn't mean that low-power S0 idle is not usable. It merely means that using S3 on the given system is more beneficial from the energy saving perspective than using low-power S0 idle, as long as S3 is supported. Suspend-to-idle is still a valid suspend mode if ACPI_FADT_LOW_POWER_S0 is not set and the pm_suspend_via_firmware() check in pch_wpt_suspend() is sufficient to distinguish suspend-to-idle from S3, so drop the confusing ACPI_FADT_LOW_POWER_S0 check. Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com> Acked-by: Zhang Rui <rui.zhang@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.