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diff --git a/sys/dev/acpi_support/acpi_wmi.c b/sys/dev/acpi_support/acpi_wmi.c
--- a/sys/dev/acpi_support/acpi_wmi.c
+++ b/sys/dev/acpi_support/acpi_wmi.c
@@ -580,6 +580,16 @@
}
wq_method[2] = winfo->ginfo.oid[0];
wq_method[3] = winfo->ginfo.oid[1];
+ {
+ ACPI_HANDLE wq_handle;
+ ACPI_OBJECT_TYPE at;
+
+ if (ACPI_SUCCESS(AcpiGetHandle(sc->wmi_handle, wq_method, &wq_handle)) &&
+ ACPI_SUCCESS(AcpiGetType(wq_handle, &at)) &&
+ at != ACPI_TYPE_METHOD) {
+ wq_input.Count = 0;
+ }
+ }
status = AcpiEvaluateObject(sc->wmi_handle, wq_method,
&wq_input, out);
if ((winfo->ginfo.flags & ACPI_WMI_REGFLAG_EXPENSIVE)

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