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This page last modified: Dec 26 2006
This info applies to Fedora Core (and may apply to other Linux
distros). My problem occured when upgrading a FC3 system to FC5 and
the acpi drivers apparently changed. The working acpi setting from FC3
made a nasty mess of FC5.

You see this error on the console:

transmit timed out status 0003 PHY status 786d resetting

Ethernet appears to be there, but no packets reach the interface. You
can tell this by looking at the output of ifconfig. There will be no
rx or tx packets.

Also, the AGP section of dmesg will be weird and full of zeros.

In file /boot/grub/menu.lst
Remove any acpi options from the kernel line, and add this:

nolapic noapic acpi=off