[Bug 460857] Re: ftdi serial driver broken in linux-image-2.6.31-14-generic (2.6.31-14.48)

[David]

I was a little hesitant to do that, because last time I did it my
computer wouldn't boot any more and I had to reinstall from scratch,
because of a bug in grub.  But I went ahead and tried it anyway, and
sure enough it helped.  When I plug and unplug the Arduino, /dev/ttyUSB0
comes and goes with it.  So far so good.

However, my "original" problem remains.  I tried running avrdude from
the command line (via a simple script that I created) to write a hex
file to the Arduino.  The file simply says:

/usr/bin/avrdude -pm168 -carduino -P/dev/ttyUSB0 -b19200 -v
-Uflash:w:Template.hex:a

It actually ran (but failed) on the first try, giving me two lines of
"programmer not responding".  Remembering what you said about the RTS
reset, I tried it again, this time hitting the reset button on the
Arduino.  This time it hung just like before, where ctl-c was ignored.
Ctl-z did pause it, but actually killing it seems impossible.  Here's a
short transcript of what transpired:

david at studyHP:~/apps$ jobs
[1]-  Running                 tail -f /var/log/messages &  (wd: ~)
[2]+  Stopped                 ./avrdude.sh
david at studyHP:~/apps$ kill -n 9 2
bash: kill: (2) - Operation not permitted
david at studyHP:~/apps$ jobs -l
[1]-  2173 Running                 tail -f /var/log/messages &  (wd: ~)
[2]+  2211 Stopped                 ./avrdude.sh
david at studyHP:~/apps$ kill -9 2211
david at studyHP:~/apps$ jobs
[1]-  Running                 tail -f /var/log/messages &  (wd: ~)
[2]+  Killed                  ./avrdude.sh
david at studyHP:~/apps$ jobs
[1]+  Running                 tail -f /var/log/messages &  (wd: ~)
david at studyHP:~/apps$ ps u
USER       PID %CPU %MEM    VSZ   RSS TTY      STAT START   TIME COMMAND
david     2133  0.0  0.0  21392  4200 pts/0    Ss   19:45   0:00 bash
david     2173  0.0  0.0   9460   832 pts/0    S    19:46   0:00 tail -f /var/log/messages
david     2212  0.0  0.0      0     0 pts/0    D    19:51   0:00 [avrdude]
david     2293  0.0  0.0  15164  1136 pts/0    R+   20:02   0:00 ps u

As you can see, as far as bash is concerned the job is gone, but ps shows it still there as a zombie.
I disconnected the Arduino, and got "usb 4-1: USB disconnect, address 3" in var/log/messages.  However, just like before, the device is still there:

david at studyHP:~/apps$ ls -l /dev/ttyU*
crw-rw---- 1 root dialout 188, 0 2010-01-01 19:51 /dev/ttyUSB0
david at studyHP:~/apps$ lsof -i |grep /dev/ttyUSB0
david at studyHP:~/apps$ 

If you can actually program your Arduino with 64 bit Ubuntu, I'm not
going to give up yet, but man it shouldn't be this hard to do.

David

-- 
ftdi serial driver broken in linux-image-2.6.31-14-generic (2.6.31-14.48)
https://bugs.launchpad.net/bugs/460857
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