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la x520 marche j'en ai une dans mon 879U-RP, par contre il faut des optiques codées intel sinon le port disparait.
le mot clé a chercher dans dmesg c'est ixgbe
DA cables have an EEPROM within them that holds, among other things, a hex value that describes what type of cable is attached (this is the Identifier Field if you're following along in the spec document.) Our driver expects a value of 03h, which corresponds to SFP or SFP "Plus". If the driver finds an unexpected value when querying the EEPROM, it will report an unsupported module and shut the card down.
There are two ways to fix this, either 1.) the cable manufacturer changes their Identifier value or 2.) the cable manufacturer works with Intel to validate their cable, and then we can teach our driver to recognize their particular "Vendor Specific" ID and initialize with it. Both of these cases involve direct communication between the cable vendor and Intel, and our TA will speak to how this communication should work.