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Date: Sun, 28 Oct 2007 15:39:55 +0700
From: Eugene Grosbein <eugen@kuzbass.ru>
To: stable@freebsd.org
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Subject: CMOS, daylight saving time and dual-boot
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Hi!

I have dual-boot machine with 7.0-BETA1 and Windows
that keeps CMOS time local (there is /etc/wall_cmos_clock also).

It was tuned off yesterday evening and turned back on today,
loading FreeBSD. Meantime the switch from Summer Time to Standard Time
has ocurred. There is 'ntpd_enable="YES"' in /etc/rc.conf.
Nothing in a system reacted on the end of Summer Time period,
so ntpd just complained about 3600 seconds exceeded sanity limit
and bailed out (documented behavour).

There is Status Register B at the offset 0x0b in the ISA Compatible CMOS,
its least significant bit should keep Daylight Saving flag (on/off).
Is it used in modern hardware? Does FreeBSD use it? It is supposed to use it?

Eugene Grosbein