I recently picked up an Intel Ultimate-N 6300 from Amazon for my laptop. I’m at the point where, when I’m moving big files to/from my NAS over the wireless connection, I really need the speed of Wireless N.
Unfortunately, Ubuntu didn’t seem to share my enthusiasm for speed — for some strange reason the card remained “locked” at the 54Mbps speed, even though it saw the 5ghz-band SSID.
Fortunately my fix was just a Google away. An article on Ubuntuforums.org had this to say, along with the fix:
The problem seems to be that the iwlagn-driver doesnt work right for every supported chip in N-Mode. So the N-Mode is deactivated by default.
To re-enable the N-mode on your card, run these commands as root:
modprobe iwlagn 11n_disable=0
If your card works in N-mode, you can make it permanent:
options iwlagn 11n_disable=1
options iwlagn 11n_disable=0
You could also simply delete the file. However, editing is reversible in case the card starts misbehaving.
After doing this, my card is up to 270Mbps and all is good.
Did this work for you? Have a different method? Please feel free to share in the comments below!