On version 11.04 Ubuntu I have access to my Wifi, but after I upgrade to 11.10, I can never get wifi at all. If I'm wired then it works, but if I'm not then it doesnt work.
For 12.04 and 11.10
I had the same problem with the same computer enter these commands and it will be solved.
sudo modprobe -r iwlagn sudo modprobe iwlagn bt_coex_active=0
If it worked you need to make it permanent.
To make the change permanent:
gksu gedit /etc/modprobe.d/iwl.conf
Copy/paste this line into the new file:
options iwlagn bt_coex_active=0
Save and quit.
After you do this you will experience very slow internet connection but it can be solved by making iwlag not use n and it can be done with these commands.
sudo rmmod -f iwlagn sudo modprobe iwlagn 11n_disable=1
if you see it made a difference once again you must make it perminent..
gksu gedit /etc/modprobe.d/iwlagn-disable11n.conf options iwlagn 11n_disable=1
Save and quit. And thats all
Thank you WBMachinery for this.
I arrived here trying to find out why the broadcom wireless in my acer aspire laptop was performing slowly. The originally proposed fix on the fedora bug worked for me:
Please create a file called /etc/modprobe.d/iwlwifi.conf with a single line like this:
options iwlwifi 11n_disable=1
Then reboot (or "modprobe -r iwlwifi ; modprobe iwlwifi" as root).
I also had to rmmod brcmsmac, which is the broadcom specific bit, so pay attention to your module dependencies.