@Victor
You could have a look at Bug #463625, as this is about the exact same
ThinkPad adapter you are experiencing problems with:
$ sudo lspci -vvnn
03:00.0 Ethernet controller [0200]: Atheros Communications Inc. AR5212
802.11abg NIC [168c:1014] (rev 01)
Subsystem: IBM Device [1014:058a]
This bug has a upstream kernel bug attached, and I think some backing on
both is needed, if this bug should ever be taken serious. Even though
bug-description mentions poor connection speed as an issue, latest
ubuntu updates or kernels seems to make connections nearly impossible
depending on the distance to the AP - if less than 2-3 meters connecting
in rear cases is possible, depending on things like the amount of noise
from other nearby WiFi networks.
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[Karmic Lucid] Atheros AR5211 - ath5k driver connection and performance issues
https://bugs.launchpad.net/bugs/461419
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