While upgrading to FC14, the motherboard NIC on one of my machines completely disappeared. Happily, I had a spare PCI NIC and that worked fine, so I was able to fix things while have network access. Lots of things were actually wrong. The motherboard is entitled 'DQ965', well 'DQ965CO' in its full glory. The NIC is a '82566DM Gigabit Network Connection'. One needs to download a driver from Intel; the one I grabbed was entitled 'e1000e-1.2.20'. A typical 'make install' should have worked, but Fedora (I suppose correctly) took itself from i386 to i686.PAE and the kernel sources didn't come along. So, I had to 'yum install kernel-PAE-devel' to get the correct headers. Then 'make install' in the e1000e source directory worked. It also took BOTH the 'acpi=off' and 'pcie_aspm=off' kernel arguments. For more discussion around this, see https://bugzilla.redhat.com/show_bug.cgi?id=649570
All that said, I have to rebuild and reinstall after each kernel update. See bug at http://sourceforge.net/tracker/index.php?func=detail&aid=3116036&group_id=42302&atid=447449
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