New F11 for the XO-1 build 5
pgf at laptop.org
Fri Aug 14 08:31:15 EDT 2009
> --- On Thu, 8/13/09, Paul Fox <pgf at laptop.org> wrote:
> > From: Paul Fox <pgf at laptop.org>
> > Subject: Re: New F11 for the XO-1 build 5
> > To: "Yioryos Asprobounitis" <mavrothal at yahoo.com>
> > Cc: "OLPC Development" <devel at lists.laptop.org>, "OLPC Testing"
> <testing at lists.laptop.org>, "Fedora OLPC List" <fedora-olpc-list at redhat.com>
> > Date: Thursday, August 13, 2009, 5:50 PM
> > hi yioryos --
> > yioryos wrote:
> > >
> > > --- On Thu, 8/13/09, James Cameron <quozl at laptop.org> wrote:
> > > >
> > > > rtcwake testing has shown that it needs --utc after the
> > > > first shutdown.
> > > > Prior to then the /etc/adjtime file is zero.
> > > >
> > >
> > > In my hands both time 'rtcwake -um mem -a -s 10' and 'time
> > > rtcwake -m mem -a -s 10' are a hit and miss. '-um' is better
> > > (~50%) while without the UCT option is hardly 10%. Usually
> > what exactly do you mean, by "50%" and "10%". rtcwake
> > doesn't wake at all? wakes too soon?
> Either. 10, 50% sucess means wakeup in 11-12sec
okay. waking too soon means you were woken by something
other than the RTC. you can "cat /sys/power/wakeup-source"
to see what it was.
> > hmm. i think we need to step back a bit.
> > let's ignore powerd for now -- please disable it with:
> > # initctl stop powerd
> > then, let's get rid of spurious wakeups, by turning off
> > most wakeup events:
> > # echo 0 >
> > /sys/power/wakeup_events/all
> > the lid, the power button, and the RTC alarm should still
> > be
> > capable of waking the system at this point.
> > now run:
> > # rtcwake --utc -m mem -s 10
> As JC reported, under these conditions the XO wakes up reliably.
excellent. so rtcwake is reliable, except for the timezone issue.
thanks for your testing. olpc-powerd-10-1.fc11 should be
available soon, which contains a workaround for the rtcwake
issue. (you can try it sooner by simply adding "--utc" to each
of the rtcwake commandlines in the powerd script.) and quozl and
i have brought the issue to the attention of the util-linux-ng
folks. (it actually seems that the kernel might be treating the
daylight savings time field from the RTC a little too casually.)
paul fox, pgf at laptop.org
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