I tried to reproduce this, but it seems this only happens on a real
nvidia card.

If this happens for you, can you please do the following:

 - ensure that the nvidia driver is not installed, and jockey is not
opened; best is probably to do that from a fresh install, but if you can
reproduce it again after uninstalling the driver, that's fine

  - sudo killall jockey-backend   # if that fails with "no such
process", that's okay

  - start jockey, confirm that nvidia is displayed as available, but
don't do anything yet

  - determine the PID of jockey-backend:

    ps aux|grep jockey-backend|grep -v grep |awk '{print $2}'

  -  sudo strace -f -v -s 1024 -o /tmp/jockey.trace -p 12345

     Replace 12345 with the pid you determined in the previous step

  - enable nvidia in jockey

  - confirm that it crashes

  - go back to the terminal with the strace, press Control-C, and attach
/tmp/jockey.trace here.

Thank you!

** Changed in: jockey (Ubuntu Jaunty)
       Status: Confirmed => Incomplete

-- 
jockey-backend crashed with IOError: [Errno 19] No such device
https://bugs.launchpad.net/bugs/335567
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