I have had the same problem on my PackardBell dot a netbook. Unloading acer_wmi 
also solves the problem.
I also tried to load acer_wmi wireless=1 but it fails with "unknown parameter" 
??????


laptop:~$ sudo modprobe -v acer_wmi wireless=1
insmod /lib/modules/3.0.0-12-generic/kernel/drivers/platform/x86/acer-wmi.ko 
wireless=1
FATAL: Error inserting acer_wmi 
(/lib/modules/3.0.0-12-generic/kernel/drivers/platform/x86/acer-wmi.ko): 
Unknown symbol in module, or unknown parameter (see dmesg)

laptop:~$ dmesg

.
.
[ 1887.539570] wmi: Mapper loaded
[ 1887.544982] acer_wmi: Unknown parameter `wireless'


laptop:~$ uname -a
Linux laptop 3.0.0-12-generic #20-Ubuntu SMP Fri Oct 7 14:50:42 UTC 2011 i686 
i686 i386 GNU/Linux

laptop:~$ modinfo acer_wmi
filename:       
/lib/modules/3.0.0-12-generic/kernel/drivers/platform/x86/acer-wmi.ko
alias:          wmi:676AA15E-6A47-4D9F-A2CC-1E6D18D14026
alias:          wmi:6AF4F258-B401-42FD-BE91-3D4AC2D7C0D3
alias:          wmi:67C3371D-95A3-4C37-BB61-DD47B491DAAB
license:        GPL
description:    Acer Laptop WMI Extras Driver
author:         Carlos Corbacho
srcversion:     B4800EB97ECD63B5D20E3D5
depends:        sparse-keymap,wmi
vermagic:       3.0.0-12-generic SMP mod_unload modversions 686 
parm:           mailled:Set initial state of Mail LED (int)
parm:           brightness:Set initial LCD backlight brightness (int)
parm:           threeg:Set initial state of 3G hardware (int)
parm:           force_series:Force a different laptop series (int)
parm:           ec_raw_mode:Enable EC raw mode (bool)

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https://bugs.launchpad.net/bugs/846719

Title:
  Conflict between acer-wmi and brcmsmac kernel modules

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