Adding this symlink fixes things for me:

rwxrwxrwx 1 root root 34 2009-11-04 11:01
/lib/firmware/2.6.31-14-generic/lbm-iwlwifi-5000-2.ucode ->
/lib/firmware/iwlwifi-5000-2.ucode

It may be co-incidence, but without the symlink I was experiencing very
unstabie connections - Thinkpad R500, Karmic amd64 - whereas with it
things are stable. Without the symlink I get logged:

[   40.952984] iwlagn 0000:03:00.0: firmware: requesting 
lbm-iwlwifi-5000-2.ucode
[   42.076259] iwlagn 0000:03:00.0: lbm-iwlwifi-5000-2.ucode firmware file req 
failed: -2
[   42.077434] iwlagn 0000:03:00.0: firmware: requesting 
lbm-iwlwifi-5000-1.ucode
[   42.290014] iwlagn 0000:03:00.0: Loaded firmware lbm-iwlwifi-5000-1.ucode, 
which is deprecated. Please use API v2 instead.

I then have frequent disconnections of the wireless, accompanied by:

iwlagn 0000:03:00.0: Microcode SW error detected.  Restarting 0x2000000

As well as numerous Kernel oops'es.

[Without the backports installed I, I experience frequent lockups unless
I disable wireless]

-- 
Incorrect Intel firmware file name
https://bugs.launchpad.net/bugs/453064
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