[Bug 212450] Suspend with Fn+F4 broken after revision 283678

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=212450

            Bug ID: 212450
           Summary: Suspend with Fn+F4 broken after revision 283678
           Product: Base System
           Version: 11.0-RC1
          Hardware: amd64
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: kern
          Assignee: freebsd-bugs at FreeBSD.org
          Reporter: jrm at ftfl.ca
                CC: freebsd-amd64 at FreeBSD.org
                CC: freebsd-amd64 at FreeBSD.org

After revision 283678, which changed sys/dev/acpi_support/acpi_ibm.c,
suspending with Fn+F4 no longer works on a Lenovo X220.

If the snippet below is removed from acpi_ibm_attach(), suspend works again.

        /* Enable events by default. */
        ACPI_SERIAL_BEGIN(ibm);
        acpi_ibm_sysctl_set(sc, ACPI_IBM_METHOD_EVENTS, 1);
        ACPI_SERIAL_END(ibm);

Joseph

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