[Dextrose] WiFi vs Suspend

Paul Fox pgf at laptop.org
Wed Aug 25 09:38:05 EDT 2010


tony -- thanks for this.  if you could, please open a trac ticket (bug
report) at http://dev.laptop.org to describe this issue.  the next
time it occurs, in order to more simply gather most of the information
bernie asked for, plus a little more that may be useful, please run
the command "olpc-log" from a Terminal window.  this will create a
file called "logs.<serial_no>.<timestamp>.tar.bz2" in your current
directory.  please attach that file to the trac ticket.  in fact,
please run the command twice -- once during the "locked up" period,
and again after, and attach both files.  possibly overkill, but might
be useful.

(the "olpc-log" command takes an fairly long time to run, but it collects
lots of information.)

paul

forster at ozonline.com.au wrote:
 > Bernie
 > 
 > Sorry, on closer inspection its not locked up, it just looks like its locked up 
 > because it is doing something else for a long time.
 > 
 > Can be replicated 100%. Shut the lid for a while, 5 minutes is not long enough 
 > 1.5 hours is. Resume from sleep. The Wifi shows it is connected at 100% signal 
 > (signal is not 100%). There is no internet access. There is no response to 
 > Disconnect. Previously I had given up and restarted but if you wait 3 minutes 
 > or so it disconnects and then works normally.
 > 
 > Tony
 > 
 > > [cc += olpc-devel]
 > > 
 > > El Wed, 25-08-2010 a las 11:05 +1000, forster at ozonline.com.au escribió:
 > > > OS373pyg
 > > > Wifi is locked up after resume from sleep, must restart.
 > > > I presume this bug is being tracked at dev.laptop.org/ in one of the 4 
 > tickets below
 > > 
 > > >   http://dev.laptop.org/ticket/10232  WiFi dies on suspended XO-1,os300
 > > >   http://dev.laptop.org/ticket/10092  Networking broken over suspend/resume 
 > on os13 for XO-1
 > > >   http://dev.laptop.org/ticket/9960   wake-on-WLAN doesn't always work\ 
 > (duplicate)
 > > >   http://dev.laptop.org/ticket/9967   ibertas suspend fails on XO-1 (fixed)
 > > 
 > > There are a number of unsolved bugs in the libertas kernel driver or in
 > > its fantastically proprietary firmare. If you turned on automatic power
 > > management on an XO-1, you might be seeing this other one:
 > > 
 > >  http://dev.laptop.org/ticket/10195
 > > 
 > > 
 > > In short, very rarely the libertas usb8xxx disappears from the USB bus
 > > when it receives certain commands from the driver. Suspend/resume are
 > > known to trigger quite frequently and the mesh also seems to cause it
 > > once or twice per day in a classroom of 30 students.
 > > 
 > > Because time for debugging was running out, in the latest beta builds I
 > > had to disable both mesh support and automatic power management in the
 > > attempt to get rid of this bug. After one week of testing, the problem
 > > was not reported any more.
 > > 
 > > If you spot this bug again, could you please:
 > > 
 > >  * check whether eth0 is still visible with "ifconfig -a"
 > > 
 > >  * check whether the Marvell 8xxx is still visible with "lsusb"
 > > 
 > >  * "dmesg >dmesg.out" and attach it to the bug. Dextrose enables
 > >    libertas debug in /etc/rc.local to help diagnose this bug.
 > > 
 > > 
 > > This never ending saga brings me back to an exasperated email that David
 > > Woodhouse wrote about 3 years ago, after spending many days in
 > > unfruitful debugging, in which he warned that access to the source code
 > > of the firmware was essential in order to nail down all the obscure
 > > Libertas bugs.
 > > 
 > > -- 
 > >    // Bernie Innocenti - http://codewiz.org/
 > >  \X/  Sugar Labs       - http://sugarlabs.org/
 > > 
 > > 
 > > _____________________________________________________
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 > > see http://www.australiaonline.net.au/mailscanning
 > 
 > part 2     text/plain                 129
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=---------------------
 paul fox, pgf at laptop.org


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