New F11 for the XO-1 build 5

[Paul Fox]

yioryos wrote:
 > 
 > 
 > --- 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
=---------------------
 paul fox, pgf at laptop.org