Public bug reported:

I installed Ubuntu 12.10 (x86_64) on a MacBook Air (5,2) and the wifi
worked fine with the kernel linux-image-3.5.0-17-generic. Later new
kernels came with the updates and wifi stopped working. It doesn't work
with  linux-image-3.5.0-19-generic,linux-image-3.5.0-21-generic,linux-
image-3.5.0-22-generic.

Disabling the Broadcom additional driver helped, so wifi is usable again
with this workaround. I don't know this additional driver is necessary
or not, but I think a kernel update shouldn't break any driver.

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


** Tags: bcm43224 macbookair

** Attachment added: "boot with kernel 3.5.0-17-generic"
   
https://bugs.launchpad.net/bugs/1102993/+attachment/3494512/+files/syslog-3.5.0-17-generic

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https://bugs.launchpad.net/bugs/1102993

Title:
  Broadcom  BCM43224 wifi card doesn't work (MacBook Air 5,2)

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