As Nick says, I ran into a problem with these symptoms on an X200,
with the same type of wireless adapter. I tried both 2.6.35 and
2.6.35.2 at the time. Commit 3ee378d7e0dfdb9bb342f59067d0d83cec9b766e
from 2.6.35.4, which I see is included in the most recent maverick
kernel upload (2.6.35-20.29; binaries pending publication when I
checked), doesn't look immediately inapplicable, so I'm trying out
vanilla 2.6.35.4 to see if I run into the problem again.
As Nick says, I ran into a problem with these symptoms on an X200, bb342f59067d0d8 3cec9b766e
with the same type of wireless adapter. I tried both 2.6.35 and
2.6.35.2 at the time. Commit 3ee378d7e0dfdb9
from 2.6.35.4, which I see is included in the most recent maverick
kernel upload (2.6.35-20.29; binaries pending publication when I
checked), doesn't look immediately inapplicable, so I'm trying out
vanilla 2.6.35.4 to see if I run into the problem again.