Hi Mathieu,
Although your hardware is slightly different, it seems to me like you're
suffering from the same problem as in bug #582199 and that the workaround
suggested there would apply to you too.
** Changed in: alsa-driver (Ubuntu)
Status: New => In Progress
** Changed in: alsa-driver (Ubuntu)
Assignee: (unassigned) => David Henningsson (diwic)
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[Realtek ALC269] no sound on external speaker jack (Optiplex 980)
https://bugs.launchpad.net/bugs/588031
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