Similar problem using:
06:03.0 Network controller: Intel Corporation PRO/Wireless 2200BG Network 
Connection (rev 05)
on an Acer Aspire 1690 laptop.

After upgrading from 7.04 to 7.10 I started having random problems with 
shutting down. Sometimes the system hung and I had to push the power off button 
to get my laptop off. More often I have seen my system waiting for about 40 sec 
after the "Will now halt" message and then getting down after showing the next 
message:
.
.
 * Will now halt
[41055.354000] ipw2200: ipw2200-bss.fw request_firmware failed
[41055.356000] ipw2200: unable to load firmware: -2
[41055.356000] ipw2200: failed to up device
halt: Unable to iterate IDE devices: No such file or directory

(The last line shows up even if the problem doesn't happen, propably has
nothing with this problem to do)

Actually the problem of hanging up at shutting down doesn't occur
anymore, whether the problem of retarding the shuting down occurs
randomly about 50% I shut down.

At the time after upgrading to gutsy I 've been also experimenting with
suspend and hibernate, which initially didn't work. Thus I can't say if
the factor that triggered the problem was the upgrade or my
Suspend/Hibernate testing.


** Attachment added: "vlcsnap-644986.png"
   http://launchpadlibrarian.net/10628779/vlcsnap-644986.png

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network-manager fails to stop properly when connected to wireless
https://bugs.launchpad.net/bugs/155216
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