I finally found the cause of the problem : BIOS SETUP!
There is an obscure item "Action Keys set-up" which is "activated" by default : 
Functions keys overides normal F1-F12 keys behaviour.

Setting it to "desactivate" restore normal behaviour

** Attachment added: "Bios Set-up"
   
https://bugs.launchpad.net/ubuntu/+source/udev/+bug/1025543/+attachment/3236500/+files/2012-07-26%2006.53.13.jpg

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https://bugs.launchpad.net/bugs/1025543

Title:
  Fn keys mis-mapped

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