It is reported that commit a192aa923b (ACPI / LPSS: Consolidate
runtime PM and system sleep handling) introduced a system suspend
regression on some machines, but the only functional change made by
it was to cause the PM quirks in the LPSS to also be used during
system suspend and resume. While that should always work for
suspend-to-idle, it turns out to be problematic for S3
(suspend-to-RAM).
To address that issue restore the previous S3 suspend and resume
behavior of the LPSS to avoid applying PM quirks then.
Fixes: a192aa923b (ACPI / LPSS: Consolidate runtime PM and system sleep handling)
Link: https://bugs.launchpad.net/bugs/1774950
Reported-by: Kai-Heng Feng <kai.heng.feng@canonical.com>
Tested-by: Kai-Heng Feng <kai.heng.feng@canonical.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Reviewed-by: Ulf Hansson <ulf.hansson@linaro.org>
Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Acked-by: Mika Westerberg <mika.westerberg@linux.intel.com>
Cc: 4.15+ <stable@vger.kernel.org> # 4.15+
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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