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From Wiki:
brcm80211
The brcm80211 driver is included in the kernel since 2.6.37. No further action is necessary on the part of the user.
So ... I have KDE, networkmanager and it works. Sort of. Connecting wired even mobile is ok, but not wireless; I can see the networks, but connecting? No, Sir! Same behavior for wep or wpa or even open.
What to do?
As wiki says, no further action has been taken -- no modules specifically mentioned in rc.conf etc -- just plain stock (with autoload dbus networkmanager and kdm for kde)
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Try not using network-manager:
https://bbs.archlinux.org/viewtopic.php?id=107609
Also, try connecting via the command line. These commands usually work for me. Assuming the wireless is eth1. Yours may be wlan0:
ifconfig eth1 up
iwconfig eth1 essid YourEssid
dhclient eth1
If dhclient doesn't work, try dhcpcd.
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