I tested a recompiled brcmsmac module with the patch mentioned above : not 
better.
I also tried to add the patch from 
https://git.kernel.org/?p=linux/kernel/git/linville/wireless-testing.git;a=commit;h=edc7651f3a4ffa7fca37d92401562694121512ad
 : not better.

I had a further look at the changelog. This commit looks more promising :
https://git.kernel.org/?p=linux/kernel/git/linville/wireless-testing.git;a=commit;h=898d3c3b2462cd439edb575f43b732425693aff0
It changes the way brcmsmac reads info from sprom, by using the bcma module. 
This includes changing the way it reads the country code.
So it might be a good candidate for a backport test.

Unfortunately, it seems more difficult to backport this commit. The patch does 
not fit well on the source code of kernel 3.2.0-31, and I suppose it would also 
need to backport some code for bcma module and recompile it.
I did not manage to compile brcmsmac this way.

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https://bugs.launchpad.net/bugs/931168

Title:
  14e4:4727 brcm80211 Wifi driver : cannot connect to channels>11

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