D38325.diff
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	diff --git a/sys/x86/isa/atrtc.c b/sys/x86/isa/atrtc.c
	--- a/sys/x86/isa/atrtc.c
	+++ b/sys/x86/isa/atrtc.c
	@@ -62,6 +62,11 @@
	#include <machine/md_var.h>
	#endif

	+/* tunable to detect a power loss of the rtc */
	+static bool atrtc_power_lost = false;
	+SYSCTL_BOOL(_machdep, OID_AUTO, atrtc_power_lost, CTLFLAG_RD, &atrtc_power_lost,
	+ false, "RTC lost power on last power cycle (probably caused by an emtpy cmos battery)");
	+
	/*
	* atrtc_lock protects low-level access to individual hardware registers.
	* atrtc_time_lock protects the entire sequence of accessing multiple registers
	@@ -600,6 +605,7 @@

	/* Look if we have a RTC present and the time is valid */
	if (!(rtcin(RTC_STATUSD) & RTCSD_PWR)) {
	+ atrtc_power_lost = true;
	device_printf(dev, "WARNING: Battery failure indication\n");
	return (EINVAL);
	}