[Trac #841] reproducible loss of wireless association

[Zarro Boogs per Child]

#841: reproducible loss of wireless association
----------------------+-----------------------------------------------------
 Reporter:  Quozl     |       Owner:  marcelo  
     Type:  defect    |      Status:  new      
 Priority:  low       |   Milestone:  Untriaged
Component:  wireless  |    Keywords:           
----------------------+-----------------------------------------------------
 On build 239, B-Test-1 units, wireless association is lost while playing
 lots of small loud sounds and repeated calling of ''iwconfig''.

 When running the ''af'' test script below, initially the tones appear with
 normal regularity.  After some time but under a minute, the rate of tones
 slows down to once every few seconds, cause unknown.  At or near this
 time, the wireless LED begins to flash.  Signal level may go to 0 or to
 -256 just before association is lost.  The wireless LED is extinguished.
 Association may or may not be regained.

 /usr/local/bin/signal-level:

 {{{
 #!/bin/sh
 /sbin/iwconfig eth0|\
 awk '/Signal level/ {print $4}'|\
 cut -f2 -d=
 }}}

 /usr/local/bin/af:

 {{{
 #!/bin/sh
 while true; do
     aplay /tmp/sine`signal-level`.wav
 done
 }}}

 /usr/local/bin/af-table-create:

 {{{
 #!/bin/sh
 for x in `seq -90 -30`; do
     FREQ=`echo "(90$x)*100+500"|bc`
     sox -t nul /dev/null -r 44100 -w /tmp/sine$x.wav \
         synth 00:00:00.05 sine create $FREQ
 done
 }}}

 (this last script is normally run on another system, with the resulting
 files copied to the test unit).

-- 
Ticket URL: <http://dev.laptop.org/ticket/841>
One Laptop Per Child <http://laptop.org/>