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IntelLucy.kext is an open source driver for the Intel X500 family of 10GBit network adapters.

What's New in Version 1.0.3   See changelog


  • Disabled ASPM for the X520 adapters as it is broken and may case erratic behaviour.
  • Enabled ASPM on X540 and X550 provided they report ASPM compliance.
  • Fixed a link status reporting issue for RJ-45 ports (X540 and X550).
  • Removed support for 10 Mbit/s data rate because it is unsupported on X520 and X540.
  • Resolved a conflict between adaptive interrupt throttling and Receive See Coalescing.


Known issues:

  • Manual media selection doesn't work. The link is always established with the highest data rate both link partners support, i.e. 10 Gbit/s of both endpoints support it, 1 Gbit/s if the link partner is a Gigabit device, etc. As DAC cables and fibre optics usually are fixed-speed devices, only RJ-45 ports are affected by this limitation.


All users are advised to update to version 1.0.3.

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