Hi guys, I'm very frustrated and disappointed because I can't make my broadcom 4312 work with b43...
It used to work on older ubuntu kernels, but not now, with newer ubuntu releases and BackBox 3.05.

After a fresh BackBox install, my wireless card wasn't recognized at all, even after installing the b43 lpphy firmware installer...
After many trials and errors, I solved this (and a scanning problem) by upgrading to a newer kernel (3.5) which seems to work best among other versions, as I read on this forum (http://forum.backbox.org/hardware-support/dell-inspiron-e1505-bcm4311-problems-no-wireless/15/).

But now there's a last annoying problem, which is giving me headache:
I can connect to my AP succesfully, and at first the internet connection works ok, but just for some minutes.
After, even if I'm still connected to my AP, the webbrowser or the terminal (ping command for example) cannot contact the requested server, behaving like I have no connection..
After a lot of time and randomly, it seems to start working again, but for a little time, and then again and again...

I don't know how to understand and solve this problem, can anyone help?
Thank you!

Hi Gia90,
i guess you have already searched on google, but if you simply type linux bcm4312 lots of useful results come out. You can try those solutions proposed for different OSs.
One of the options in these cases could be installing vendor supplied drivers from source. You usually find them on the official vendor website.
Another useful thing would be looking in your log files when you have the issue, and see what is going on... maybe it's due to wrong drivers.

Also, you can do as proposed by ZEROF... maybe more recent kernel and backports would solve your problem.

Let us know.
Bye!

and I don't really like proprietary things :S

Eheh, we don't as well! 
But you can see b43 requires proprietary firmware too... and sometimes this is the only solution to have things working.
Or if this is the point, just buy a new wireless adapter wich works with open drivers.
Then yes, i was talking about dmesg (kern.log) and syslog.
Maybe try to look to http://wireless.kernel.org/ for your wifi card, or install backports as told by ZEROF.

Hope you'll solve...
Bye!

Hi,

Do you see that every man from this forum try to help you ? If you don't see that our help is good for you, just buy adapter with good chipset and you will not have future problems. I tested so many ways and adapters last two years that you can't even imagine, and i always found workout. Because of that i can say you that in some point you have done something wrong working on system settings.

Can you provide adapter model name, serial and MAC address ? After this i will look one more time, but nobody can promise you solution that will be one click move.

Good luck.