[gentoo-user] Re: Winter clock change did not happen

Mick <michaelkintzios@×××××.com> writes:

> I dual boot with MSWindows and therefore have set up my /etc/conf.d/clock to:
>
> CLOCK="local"
> TIMEZONE="Europe/London"
> CLOCK_OPTS=""
> CLOCK_SYSTOHC="no"
> SRM="no"
> ARC="no"
>
> I noticed this morning that the clock was still showing summer time (I rarely
> boot into MSWindows).

Was Linux running since before the time change? I suppose it would at
least show the right time if that was the case. If it works, you still
need CLOCK_SYSTOHC="yes" if you want Linux to change the clock.

Linux has no way to know if the time change was done (nor windows),
unless the systems are syncing with other clock (NTP), so both of them
will boot up and think this "local" time is the winter time.

The systems may still register if they already did the timezone change,
so that they know what to do (that was the case with windows 98).

> I had to boot into MSWindows to check what happens there and the clock was
> showing the new winter time.  After that the Linux clock was also showing the
> updated winter time.
>
> Does this mean that twice a year when the clock changes I need to boot into
> MSWindows first to allow the time change to take place, or is there a Linux
> side fix for my dual boot set up?

You can write something so that Linux changes the clock, but then be
sure Windows is not set to change it.

A better (read "more complicated") solution would involve some sync
mechanism between both operating systems so that one can tell if the
other already changed the clock.

Unless windows now supports UTC clocks, you have to live either with
this or with an always on winter clock on windows.

-- 
Nuno J. Silva
gopher://sdf-eu.org/1/users/njsg