I just compared the current version (6.20.155.1) of bcmwl-kernel-source
against the 5.100.82.112 version of the driver from quantal (downloaded
from http://packages.ubuntu.com/raring/amd64/bcmwl-kernel-
source/download)

Experimental setup was as follows:

Computer A: BCM4313 on Windows pinging off-site machine
Computer B: BCM4313 Linux box pinging same off-site machine

Prior to activating computer B's wifi, computer A had no ping timeouts
in five minutes. After activating wifi on computer B with the 6.x
driver, computer A had several ping timeouts within 1 minute. Upon
shutting off wifi on computer B, computer A had no ping timeouts. This
behavior has already been established by posts above, but is confirmed
on my machine.

Then I installed the 5.x version of the driver using `dpkg -i` and
repeated the experiment. As before prior to activating wifi on machine
B, there were no ping timeouts on computer A. I turn on computer B's
wifi and started pinging. Computer A had NO ping timeouts within three
minutes. Then I started watching a video on YouTube. Computer A's ping
times increased slightly (competing for bandwidth). After five minutes,
only ONE ping timeout on computer A occurred.

So it would appear something changed between the 5.100.82.112 and
6.20.155.1 version of the drivers. Because I have a nice setup here and
there were seven commits between these driver versions so I can probably
debug this. Prior to me doing this though, can someone else check that
they receive no interference with the 5.100.82.112 version of the
driver.

Thanks.

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https://bugs.launchpad.net/bugs/1174145

Title:
  Broadcom 4313 causes heavy interference with wireless clients after
  13.04 upgrade

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