Problem with e1000: EEPROM Checksum Is Not Valid

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Problem Description

On certain ThinkPads, e1000 driver for Intel Gigabit controller fails to load with the following error message in /var/log/messages: 

e1000: 0000:02:00.0: e1000_probe: The EEPROM Checksum Is Not Valid
e1000: probe of 0000:02:00.0 failed with error -5

The problem is caused by a power savings feature obstructing normal operation, and causes the first bytes read from the EEPROM to be corrupt, resulting in a random or invalid MAC address (but no other data corruption). The EEPROM checksum test traps the problem and the driver refuses to load.

Solutions

Try to reload the e1000 module until the ethernet is pluged in, and the hardware have a chance to detect a link.

From Lenovo

Lenovo provides a script that uses 'ethtool' command to update the card's settings. They say it is for SLED 10 but the Linux flavor shouldn't really matter. For some users, neither of the circumventions listed below help, but this script does!

Via module parameter

In recent kernels (at least with 2.6.22, maybe also in 2.6.21) there is a kernel module option to make the module ignore the error.

Load the module like this 

modprobe e1000 eeprom_bad_csum_allow=1

You might also apply that parameter via modprobe.d or if you are using Debian/Ubuntu as append-line in your bootloader: e1000.eeprom_bad_csum_allow=1

From Mat's Blog

The fundamental solution is explained at Mat's Blog which directs the reader to Intel's site to download PROBOOT.EXE. Extract files from PROBOOT.EXE onto a bootable DOS device. Boot from it. Then run the command "IBAUTIL -DEFCFG"

Circumvention

  • Upgrade your BIOS

Lenovo has published newer BIOS revisions that appear to fix the issue for some users. The BIOS upgrade turns off "Deep smart power down" which has been known to cause issues at initialization time (the driver can re-enable the issue later if you desire, the feature works correctly then).

  • Insert a cable

Inserting a linked network cable bypasses the problem.

  • Take the checksum twice

This bug report describes a fix -- take the checksum twice. First time will report a bad checksum, second will work (the problem seems to be triggered by some power-saving technology). This requires a tweak to the driver source and a rebuild of your kernel. This is much better than a previous "fix" published here that disabled checksum checking entirely.

  • Remove/add kernel module

Removing and adding the kernel module is a possible work-around. As root, run 

# modprobe -r e1000
# modprobe e1000

On some occasions, the commands have to be run twice before eth0 becomes useable. On some X60s this will not work at all.

  • Disabling and re-enabling the NIC in the BIOS

For some it fixed the issue finally, for some it helped just temporarily.

  • Hacking the kernel to carry on even if the checksum is not valid

Although being a very ugly, hack, this works fine for me. To do that, you have to search drivers/net/e1000/e1000_main.c for the line containing the error message and then comment out the following two lines which set the error state and then jump to the error code. Although this doesn't fry the hardware for me, consider yourself warned...

See also

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