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On some systems when the system is put to sleep pressing the ACPI power button will cause the EC SCI to try to wake the system by a Notify(DEV, 0x2) with an intention to wake the system up from suspend. This behavior matches the ACPI specification in ACPI 6.4 section 4.8.3.1.1.2 which describes that the AML handler would generate a Notify() with a code of 0x2 to indicate it was responsible for waking the system. This currently doesn't work because acpi_button_add() only configured `ACPI_DEVICE_NOTIFY` which means that device handler notifications 0x80 through 0xFF are handled. To fix the wakeups on such systems, adjust the ACPI button handler to use `ACPI_ALL_NOTIFY` which will handle all events 0x00 through 0x7F. Reported-by: Yijun Shen <Yijun.Shen@dell.com> Tested-by: Richard Gong <Richard.Gong@amd.com> Link: https://uefi.org/htmlspecs/ACPI_Spec_6_4_html/04_ACPI_Hardware_Specification/ACPI_Hardware_Specification.html?highlight=0x2#control-method-power-button Signed-off-by: Mario Limonciello <mario.limonciello@amd.com> Tested-by: Yijun Shen <Yijun_Shen@Dell.com> Link: https://patch.msgid.link/20250303212719.4153485-1-superm1@kernel.org [ rjw: Removed uneeded semicolon ] Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@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 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.