On Sunday 31 October 2010 13:27:11 Nuno J. Silva wrote: > Mick <michaelkintz...@gmail.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. > my > 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.
Thanks Nuno, this explains well why my Gentoo did not change the time - I do not have NTP set up on it and rely on MSWindows to sync with a time server once a month or so that I boot into it for just this reason. This is a new laptop and it seems to keep the time reliably for now. In the future I may well set up NTP if I find that the time in Gentoo is drifting (enough for me to notice). -- Regards, Mick
signature.asc
Description: This is a digitally signed message part.
