D36699.id111455.diff
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D36699.id111455.diff
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	diff --git a/sys/dev/acpica/acpi_cpu.c b/sys/dev/acpica/acpi_cpu.c
	--- a/sys/dev/acpica/acpi_cpu.c
	+++ b/sys/dev/acpica/acpi_cpu.c
	@@ -396,6 +396,17 @@
	*/
	if (!acpi_disabled("mwait") && cpu_mwait_usable())
	sc->cpu_features \|= ACPI_CAP_SMP_C1_NATIVE \| ACPI_CAP_SMP_C3_NATIVE;
	+
	+ /*
	+ * Work around a lingering SMM bug which leads to freezes when handling
	+ * CPPC notifications. Tell the SMM we will handle any CPPC notifications.
	+ */
	+ int cppcval = 0;
	+ if ((cpu_power_eax & CPUTPM1_HWP_NOTIFICATION) &&
	+ (resource_int_value("acpi", 0, "nocppcworkaround", &cppcval) != 0
	+ \|\| cppcval == 0)) {
	+ sc->cpu_features \|= ACPI_CAP_INTR_CPPC;
	+ }
	#endif

	if (devclass_get_drivers(device_get_devclass(dev), &drivers,