D54803.diff
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	diff --git a/sys/x86/cpufreq/hwpstate_amd.c b/sys/x86/cpufreq/hwpstate_amd.c
	--- a/sys/x86/cpufreq/hwpstate_amd.c
	+++ b/sys/x86/cpufreq/hwpstate_amd.c
	@@ -179,6 +179,11 @@
	&hwpstate_pkg_ctrl_enable, 0,
	"Set 1 (default) to enable package-level control, 0 to disable");

	+static bool hwpstate_amd_cppc_enable = true;
	+SYSCTL_BOOL(_machdep, OID_AUTO, hwpstate_amd_cppc_enable, CTLFLAG_RDTUN,
	+ &hwpstate_amd_cppc_enable, 0,
	+ "Set 1 (default) to enable AMD CPPC, 0 to disable");
	+
	static device_method_t hwpstate_methods[] = {
	/* Device interface */
	DEVMETHOD(device_identify, hwpstate_identify),
	@@ -667,7 +672,8 @@

	sc = device_get_softc(dev);

	- if (amd_extended_feature_extensions & AMDFEID_CPPC) {
	+ if (hwpstate_amd_cppc_enable &&
	+ (amd_extended_feature_extensions & AMDFEID_CPPC)) {
	sc->flags \|= PSTATE_CPPC;
	device_set_desc(dev,
	"AMD Collaborative Processor Performance Control (CPPC)");