On this page :
http://linuxwireless.org/en/users/Drivers/brcm80211#Developer_information
, at paragraph "Regulatory Implementation for brcmsmac" is written :

This generation of chips contain additional regulatory support
independent of the driver. The devices use a single worldwide regulatory
domain, with channels 12-14 (2.4 GHz band) and channels 52-64 and
100-140 (5 GHz band) restricted to passive operation. Transmission on
those channels is suppressed until appropriate other traffic is observed
on those channels. Within the driver, we use the ficticious country code
"X2" to represent this worldwide regulatory domain. There is currently
no interface to configure a different domain. The driver reads the SROM
country code from the chip and hands it up to mac80211 as the regulatory
hint, however this information is otherwise unused with the driver.

If I understand correctly, it would mean that channels 12-14 would be 
restricted by the hardware itself?
I suppose it does not prevent it to connect on wifis on these channels, as it 
works with another driver. Maybe it only means that the chipset can only do 
passive scanning, instead of active scanning? (which should not prevent 
connecting)

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

Title:
  brcm80211 Wifi driver : cannot connect to channels>11

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