Public bug reported:

I am on a macbook (4,1), with the following wireless card:

02:00.0 Network controller: Broadcom Corporation BCM4321 802.11a/b/g/n
(rev 03)

I'm also running natty with everything (presenty) up-to-date.  When I
unplug my laptop from a power supply, the wireless goes away after about
2-3 seconds (or less).  If i run :

sudo iwconfig eth1 power off

after this happens, my wireless comes back up.  It seems to be something
wrong with power management for this card and this hardware?

uname -a:

Linux Macbuntu 2.6.38-6-generic #34-Ubuntu SMP Tue Mar 8 14:15:57 UTC
2011 x86_64 x86_64 x86_64 GNU/Linux

** Affects: linux (Ubuntu)
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/734189

Title:
  Wireless card turns off when laptop power cable is unplugged

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