Invalid time in real time clock

[Christian Weisgerber]

Over the last few months I started noticing that my FreeBSD/amd64
desktop box would often come up with a date of Jan 1, 2008 after
boot.  Presumably the CMOS battery was dying and the motherboard
picked a date from its year of manufacture.

So I replaced the CR2032 battery on the motherboard and reapplied
the BIOS settings that had been lost during the change.  Unfortunately,
I'm still greeted with

atrtc0: WARNING: Battery failure indication
Invalid time in real time clock.
Check and reset the date immediately!

Incongruously, the RTC time is actually correct.  Well, off by a
minute or so.  Clearly the new battery is good.

I guess this is more a PC question, but how do I get the RTC to
indicate a valid time again?  The motherboard manual (Asus) is
rather silent on the whole issue of CMOS battery replacement.

-- 
Christian "naddy" Weisgerber                          naddy at mips.inka.de