BCM4331 deauthenticates every five minutes

Larry Finger Larry.Finger at lwfinger.net
Wed Jun 19 12:35:55 EDT 2013

On 06/19/2013 11:09 AM, Chris Adams wrote:
> I have a MacBook Pro 8,2 with the BCM4331 wireless chip.  I pulled the
> firmware (666.2, 2011-02-23 01:15:07) using b43-fwcutter, and am running
> Fedora 18 (tried up to kernel 3.9.6-200.fc18.x86_64 from updates/testing
> with the same results).
> My problem is that it deauthenticates from the AP every 5 minutes (it
> then immediately reconnects).  From what I've read, it looks like this
> chip is a little "different"; any ideas/suggestions to help get this
> working better?
> Example dmesg chunk:
> [  948.115374] wlan0: associated
> [ 1249.636655] wlan0: deauthenticated from 00:a0:c8:xx:xx:xx (Reason: 1)

My table shows that a "Reason 1" deauthentication is for "unspecified reasons". 
Does anyone know why these might occur?

What type of encryption are you using? If it is a re-keying type such as TKIP, 
what is the interval? You should find that on the setup page of the access point.

BTW, your mailer is set up strangely. I get your address when I do a plain 
Reply, but a Reply All from Thunderbird only got the b43-dev mailing list. I had 
to add your address manually.

I also added the linux-wireless ML to the reply as some of my questions are more 
likely to be answered there.


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