At work I have a Dell laptop with a Broadcom BCM94311MCG wireless card:
# lspci … 0b:00.0 Network controller: Broadcom Corporation BCM94311MCG wlan mini-PCI (rev 01) … # lspci -n … 0b:00.0 0280: 14e4:4311 (rev 01) …
The drivers that Ubuntu installs by default were giving me lots of headaches depending on the network’s access point: on some of them the card worked OK; on some others I kept loosing the connection every few minutes, or I couldn’t connect at all. I never found out if the problem was the encryption algorithm in use, or the wifi a/b/g/whatever protocol. Bottom line is the driver worked on some networks but didn’t on some others.
A co-worker told me he had the same problem until he switched to the ndiswrapper driver, so reluctantly I tried it. It work great. 
More info here:
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